diff --git a/actix-multipart-derive/src/lib.rs b/actix-multipart-derive/src/lib.rs
index 5738b600f..b99a0bcdb 100644
--- a/actix-multipart-derive/src/lib.rs
+++ b/actix-multipart-derive/src/lib.rs
@@ -18,17 +18,17 @@ use syn::{parse_macro_input, Type};
 #[darling(attributes(multipart), default)]
 struct MultipartFormAttrs {
     deny_unknown_fields: bool,
-    duplicate_action: DuplicateAction,
+    duplicate_field: DuplicateField,
 }
 
 #[derive(FromMeta)]
-enum DuplicateAction {
+enum DuplicateField {
     Ignore,
     Deny,
     Replace,
 }
 
-impl Default for DuplicateAction {
+impl Default for DuplicateField {
     fn default() -> Self {
         Self::Ignore
     }
@@ -136,7 +136,7 @@ struct ParsedField<'t> {
 /// ## Duplicate Fields
 ///
 /// You can change the behaviour for when multiple fields are received with the same name using the
-/// `#[multipart(duplicate_action = "")]` attribute:
+/// `#[multipart(duplicate_field = "")]` attribute:
 ///
 /// - "ignore": Extra fields are ignored (default).
 /// - "replace": Each field is processed, but only the last one is persisted.
@@ -147,7 +147,7 @@ struct ParsedField<'t> {
 /// ```
 /// # use actix_multipart::form::MultipartForm;
 /// #[derive(MultipartForm)]
-/// #[multipart(duplicate_action = "deny")]
+/// #[multipart(duplicate_field = "deny")]
 /// struct Form { }
 /// ```
 ///
@@ -168,7 +168,7 @@ pub fn impl_multipart_form(input: proc_macro::TokenStream) -> proc_macro::TokenS
 
     let attrs: MultipartFormAttrs = match MultipartFormAttrs::from_derive_input(&input) {
         Ok(attrs) => attrs,
-        Err(e) => return e.write_errors().into(),
+        Err(err) => return err.write_errors().into(),
     };
 
     // Parse the field attributes
@@ -198,7 +198,7 @@ pub fn impl_multipart_form(input: proc_macro::TokenStream) -> proc_macro::TokenS
         .collect::<Result<Vec<_>, darling::Error>>()
     {
         Ok(attrs) => attrs,
-        Err(e) => return e.write_errors().into(),
+        Err(err) => return err.write_errors().into(),
     };
 
     // Check that field names are unique
@@ -219,10 +219,10 @@ pub fn impl_multipart_form(input: proc_macro::TokenStream) -> proc_macro::TokenS
     };
 
     // Value for duplicate action
-    let duplicate_action = match attrs.duplicate_action {
-        DuplicateAction::Ignore => quote!(::actix_multipart::form::DuplicateAction::Ignore),
-        DuplicateAction::Deny => quote!(::actix_multipart::form::DuplicateAction::Deny),
-        DuplicateAction::Replace => quote!(::actix_multipart::form::DuplicateAction::Replace),
+    let duplicate_field = match attrs.duplicate_field {
+        DuplicateField::Ignore => quote!(::actix_multipart::form::DuplicateField::Ignore),
+        DuplicateField::Deny => quote!(::actix_multipart::form::DuplicateField::Deny),
+        DuplicateField::Replace => quote!(::actix_multipart::form::DuplicateField::Replace),
     };
 
     // read_field() implementation
@@ -232,7 +232,7 @@ pub fn impl_multipart_form(input: proc_macro::TokenStream) -> proc_macro::TokenS
         let ty = &field.ty;
         read_field_impl.extend(quote!(
             #name => ::std::boxed::Box::pin(
-                <#ty as ::actix_multipart::form::FieldGroupReader>::handle_field(req, field, limits, state, #duplicate_action)
+                <#ty as ::actix_multipart::form::FieldGroupReader>::handle_field(req, field, limits, state, #duplicate_field)
             ),
         ));
     }
diff --git a/actix-multipart/Cargo.toml b/actix-multipart/Cargo.toml
index 0b27c29e1..5fe5507bf 100644
--- a/actix-multipart/Cargo.toml
+++ b/actix-multipart/Cargo.toml
@@ -9,6 +9,10 @@ repository = "https://github.com/actix/actix-web.git"
 license = "MIT OR Apache-2.0"
 edition = "2018"
 
+[package.metadata.docs.rs]
+rustdoc-args = ["--cfg", "docsrs"]
+all-features = true
+
 [features]
 default = ["tempfile", "derive"]
 derive = ["actix-multipart-derive"]
@@ -19,31 +23,31 @@ name = "actix_multipart"
 path = "src/lib.rs"
 
 [dependencies]
+actix-multipart-derive = { version = "=0.4.0", optional = true }
+actix-http = "3"
 actix-utils = "3"
 actix-web = { version = "4", default-features = false }
-actix-http = "3"
-actix-multipart-derive = { version = "=0.4.0", optional = true }
 
 bytes = "1"
 derive_more = "0.99.5"
-futures-core = { version = "0.3.7", default-features = false, features = ["alloc"] }
-futures-util = { version = "0.3.7", default-features = false }
+futures-core = "0.3.17"
+futures-util = { version = "0.3.17", default-features = false, features = ["std"] }
 httparse = "1.3"
 local-waker = "0.1"
 log = "0.4"
 memchr = "2.5"
 mime = "0.3"
 serde = "1.0"
-serde_plain = "1.0"
 serde_json = "1.0"
+serde_plain = "1.0"
 # TODO(MSRV 1.60): replace with dep: prefix
 tempfile-dep = { package = "tempfile", version = "3.3.0", optional = true }
-tokio = { version = "1.8.4", features = ["sync"] }
+tokio = { version = "1.13.1", features = ["sync"] }
 
 [dev-dependencies]
+actix-multipart-rfc7578 = "0.10"
 actix-rt = "2.2"
 actix-test = "0.1.0"
 awc = "3.0.1"
-actix-multipart-rfc7578 = "0.10.0"
 futures-util = { version = "0.3.7", default-features = false, features = ["alloc"] }
 tokio-stream = "0.1"
diff --git a/actix-multipart/src/error.rs b/actix-multipart/src/error.rs
index 979f4b0f7..77b5a559f 100644
--- a/actix-multipart/src/error.rs
+++ b/actix-multipart/src/error.rs
@@ -7,9 +7,9 @@ use actix_web::{
 };
 use derive_more::{Display, Error, From};
 
-/// A set of errors that can occur during parsing multipart streams
-#[non_exhaustive]
+/// A set of errors that can occur during parsing multipart streams.
 #[derive(Debug, Display, From, Error)]
+#[non_exhaustive]
 pub enum MultipartError {
     /// Content-Disposition header is not found or is not equal to "form-data".
     ///
@@ -51,7 +51,11 @@ pub enum MultipartError {
     NotConsumed,
 
     /// An error from a field handler in a form
-    #[display(fmt = "An error occurred processing field `{field_name}`: {source}")]
+    #[display(
+        fmt = "An error occurred processing field `{}`: {}",
+        field_name,
+        source
+    )]
     Field {
         field_name: String,
         source: actix_web::Error,
diff --git a/actix-multipart/src/extractor.rs b/actix-multipart/src/extractor.rs
index 1ad1f203d..07e4e4fd4 100644
--- a/actix-multipart/src/extractor.rs
+++ b/actix-multipart/src/extractor.rs
@@ -9,8 +9,7 @@ use crate::server::Multipart;
 ///
 /// Content-type: multipart/form-data;
 ///
-/// ## Server example
-///
+/// # Examples
 /// ```
 /// use actix_web::{web, HttpResponse, Error};
 /// use actix_multipart::Multipart;
diff --git a/actix-multipart/src/form/bytes.rs b/actix-multipart/src/form/bytes.rs
index 1d866d528..5df50a9a0 100644
--- a/actix-multipart/src/form/bytes.rs
+++ b/actix-multipart/src/form/bytes.rs
@@ -3,7 +3,7 @@
 use actix_web::HttpRequest;
 use bytes::BytesMut;
 use futures_core::future::LocalBoxFuture;
-use futures_util::{FutureExt, TryStreamExt};
+use futures_util::TryStreamExt as _;
 use mime::Mime;
 
 use crate::{
@@ -16,9 +16,11 @@ use crate::{
 pub struct Bytes {
     /// The data.
     pub data: bytes::Bytes,
-    /// The value of the `content-type` header.
+
+    /// The value of the `Content-Type` header.
     pub content_type: Option<Mime>,
-    /// The `filename` value in the `content-disposition` header.
+
+    /// The `filename` value in the `Content-Disposition` header.
     pub file_name: Option<String>,
 }
 
@@ -30,21 +32,22 @@ impl<'t> FieldReader<'t> for Bytes {
         mut field: Field,
         limits: &'t mut Limits,
     ) -> Self::Future {
-        async move {
-            let mut data = BytesMut::new();
+        Box::pin(async move {
+            let mut buf = BytesMut::new();
+
             while let Some(chunk) = field.try_next().await? {
                 limits.try_consume_limits(chunk.len(), true)?;
-                data.extend(chunk);
+                buf.extend(chunk);
             }
+
             Ok(Bytes {
-                data: data.freeze(),
+                data: buf.freeze(),
                 content_type: field.content_type().map(ToOwned::to_owned),
                 file_name: field
                     .content_disposition()
                     .get_filename()
                     .map(str::to_owned),
             })
-        }
-        .boxed_local()
+        })
     }
 }
diff --git a/actix-multipart/src/form/json.rs b/actix-multipart/src/form/json.rs
index 1a61add78..9951eaaaf 100644
--- a/actix-multipart/src/form/json.rs
+++ b/actix-multipart/src/form/json.rs
@@ -5,7 +5,6 @@ use std::sync::Arc;
 use actix_web::{http::StatusCode, web, Error, HttpRequest, ResponseError};
 use derive_more::{Deref, DerefMut, Display, Error};
 use futures_core::future::LocalBoxFuture;
-use futures_util::FutureExt;
 use serde::de::DeserializeOwned;
 
 use crate::{
@@ -13,6 +12,8 @@ use crate::{
     Field, MultipartError,
 };
 
+use super::FieldErrorHandler;
+
 /// Deserialize from JSON.
 #[derive(Debug, Deref, DerefMut)]
 pub struct Json<T: DeserializeOwned>(pub T);
@@ -23,11 +24,14 @@ impl<T: DeserializeOwned> Json<T> {
     }
 }
 
-impl<'t, T: DeserializeOwned + 'static> FieldReader<'t> for Json<T> {
+impl<'t, T> FieldReader<'t> for Json<T>
+where
+    T: DeserializeOwned + 'static,
+{
     type Future = LocalBoxFuture<'t, Result<Self, MultipartError>>;
 
     fn read_field(req: &'t HttpRequest, field: Field, limits: &'t mut Limits) -> Self::Future {
-        async move {
+        Box::pin(async move {
             let config = JsonConfig::from_req(req);
             let field_name = field.name().to_owned();
 
@@ -37,6 +41,7 @@ impl<'t, T: DeserializeOwned + 'static> FieldReader<'t> for Json<T> {
                 } else {
                     false
                 };
+
                 if !valid {
                     return Err(MultipartError::Field {
                         field_name,
@@ -48,24 +53,23 @@ impl<'t, T: DeserializeOwned + 'static> FieldReader<'t> for Json<T> {
             let bytes = Bytes::read_field(req, field, limits).await?;
 
             Ok(Json(serde_json::from_slice(bytes.data.as_ref()).map_err(
-                |e| MultipartError::Field {
+                |err| MultipartError::Field {
                     field_name,
-                    source: config.map_error(req, JsonFieldError::Deserialize(e)),
+                    source: config.map_error(req, JsonFieldError::Deserialize(err)),
                 },
             )?))
-        }
-        .boxed_local()
+        })
     }
 }
 
 #[derive(Debug, Display, Error)]
 #[non_exhaustive]
 pub enum JsonFieldError {
-    /// Deserialize error
+    /// Deserialize error.
     #[display(fmt = "Json deserialize error: {}", _0)]
     Deserialize(serde_json::Error),
 
-    /// Content type error
+    /// Content type error.
     #[display(fmt = "Content type error")]
     ContentType,
 }
@@ -79,8 +83,7 @@ impl ResponseError for JsonFieldError {
 /// Configuration for the [`Json`] field reader.
 #[derive(Clone)]
 pub struct JsonConfig {
-    #[allow(clippy::type_complexity)]
-    err_handler: Option<Arc<dyn Fn(JsonFieldError, &HttpRequest) -> Error + Send + Sync>>,
+    err_handler: FieldErrorHandler<JsonFieldError>,
     validate_content_type: bool,
 }
 
@@ -131,9 +134,8 @@ impl Default for JsonConfig {
 mod tests {
     use std::{collections::HashMap, io::Cursor};
 
-    use actix_http::StatusCode;
     use actix_multipart_rfc7578::client::multipart;
-    use actix_web::{web, App, HttpResponse, Responder};
+    use actix_web::{http::StatusCode, web, App, HttpResponse, Responder};
 
     use crate::form::{
         json::{Json, JsonConfig},
diff --git a/actix-multipart/src/form/mod.rs b/actix-multipart/src/form/mod.rs
index e45b170d2..2052042cb 100644
--- a/actix-multipart/src/form/mod.rs
+++ b/actix-multipart/src/form/mod.rs
@@ -7,11 +7,10 @@ use std::{
     sync::Arc,
 };
 
-use actix_web::{dev::Payload, error::PayloadError, web, Error, FromRequest, HttpRequest};
+use actix_web::{dev, error::PayloadError, web, Error, FromRequest, HttpRequest};
 use derive_more::{Deref, DerefMut};
 use futures_core::future::LocalBoxFuture;
-use futures_util::TryFutureExt;
-use futures_util::{FutureExt, TryStreamExt};
+use futures_util::{TryFutureExt, TryStreamExt as _};
 
 use crate::{Field, Multipart, MultipartError};
 
@@ -26,6 +25,8 @@ pub mod text;
 #[cfg(feature = "derive")]
 pub use actix_multipart_derive::MultipartForm;
 
+type FieldErrorHandler<T> = Option<Arc<dyn Fn(T, &HttpRequest) -> Error + Send + Sync>>;
+
 /// Trait that data types to be used in a multipart form struct should implement.
 ///
 /// It represents an asynchronous handler that processes a multipart field to produce `Self`.
@@ -47,16 +48,16 @@ pub struct State(pub HashMap<String, Box<dyn Any>>);
 pub trait FieldGroupReader<'t>: Sized + Any {
     type Future: Future<Output = Result<(), MultipartError>>;
 
-    /// The form will call this function for each matching field
+    /// The form will call this function for each matching field.
     fn handle_field(
         req: &'t HttpRequest,
         field: Field,
         limits: &'t mut Limits,
         state: &'t mut State,
-        duplicate_action: DuplicateAction,
+        duplicate_field: DuplicateField,
     ) -> Self::Future;
 
-    /// Create `Self` from the group of processed fields
+    /// Construct `Self` from the group of processed fields.
     fn from_state(name: &str, state: &'t mut State) -> Result<Self, MultipartError>;
 }
 
@@ -71,27 +72,28 @@ where
         field: Field,
         limits: &'t mut Limits,
         state: &'t mut State,
-        duplicate_action: DuplicateAction,
+        duplicate_field: DuplicateField,
     ) -> Self::Future {
         if state.contains_key(field.name()) {
-            match duplicate_action {
-                DuplicateAction::Ignore => return ready(Ok(())).boxed_local(),
-                DuplicateAction::Deny => {
-                    return ready(Err(MultipartError::DuplicateField(
+            match duplicate_field {
+                DuplicateField::Ignore => return Box::pin(ready(Ok(()))),
+
+                DuplicateField::Deny => {
+                    return Box::pin(ready(Err(MultipartError::DuplicateField(
                         field.name().to_string(),
-                    )))
-                    .boxed_local()
+                    ))))
                 }
-                DuplicateAction::Replace => {}
+
+                DuplicateField::Replace => {}
             }
         }
-        async move {
+
+        Box::pin(async move {
             let field_name = field.name().to_string();
             let t = T::read_field(req, field, limits).await?;
             state.insert(field_name, Box::new(t));
             Ok(())
-        }
-        .boxed_local()
+        })
     }
 
     fn from_state(name: &str, state: &'t mut State) -> Result<Self, MultipartError> {
@@ -110,21 +112,24 @@ where
         field: Field,
         limits: &'t mut Limits,
         state: &'t mut State,
-        _duplicate_action: DuplicateAction,
+        _duplicate_field: DuplicateField,
     ) -> Self::Future {
-        // Vec GroupReader always allows duplicates!
-        async move {
+        Box::pin(async move {
+            // Note: Vec GroupReader always allows duplicates
+
             let field_name = field.name().to_string();
+
             let vec = state
                 .entry(field_name)
                 .or_insert_with(|| Box::new(Vec::<T>::new()))
                 .downcast_mut::<Vec<T>>()
                 .unwrap();
+
             let item = T::read_field(req, field, limits).await?;
             vec.push(item);
+
             Ok(())
-        }
-        .boxed_local()
+        })
     }
 
     fn from_state(name: &str, state: &'t mut State) -> Result<Self, MultipartError> {
@@ -146,27 +151,27 @@ where
         field: Field,
         limits: &'t mut Limits,
         state: &'t mut State,
-        duplicate_action: DuplicateAction,
+        duplicate_field: DuplicateField,
     ) -> Self::Future {
         if state.contains_key(field.name()) {
-            match duplicate_action {
-                DuplicateAction::Ignore => return ready(Ok(())).boxed_local(),
-                DuplicateAction::Deny => {
-                    return ready(Err(MultipartError::DuplicateField(
+            match duplicate_field {
+                DuplicateField::Ignore => return Box::pin(ready(Ok(()))),
+
+                DuplicateField::Deny => {
+                    return Box::pin(ready(Err(MultipartError::DuplicateField(
                         field.name().to_string(),
-                    )))
-                    .boxed_local()
+                    ))))
                 }
-                DuplicateAction::Replace => {}
+
+                DuplicateField::Replace => {}
             }
         }
-        async move {
+        Box::pin(async move {
             let field_name = field.name().to_string();
             let t = T::read_field(req, field, limits).await?;
             state.insert(field_name, Box::new(t));
             Ok(())
-        }
-        .boxed_local()
+        })
     }
 
     fn from_state(name: &str, state: &'t mut State) -> Result<Self, MultipartError> {
@@ -199,11 +204,13 @@ pub trait MultipartFormTrait: Sized {
 }
 
 #[doc(hidden)]
-pub enum DuplicateAction {
+pub enum DuplicateField {
     /// Additional fields are not processed
     Ignore,
+
     /// An error will be raised
     Deny,
+
     /// All fields will be processed, the last one will replace all previous
     Replace,
 }
@@ -240,12 +247,14 @@ impl Limits {
             .total_limit_remaining
             .checked_sub(bytes)
             .ok_or(MultipartError::Payload(PayloadError::Overflow))?;
+
         if in_memory {
             self.memory_limit_remaining = self
                 .memory_limit_remaining
                 .checked_sub(bytes)
                 .ok_or(MultipartError::Payload(PayloadError::Overflow))?;
         }
+
         if let Some(field_limit) = self.field_limit_remaining {
             self.field_limit_remaining = Some(
                 field_limit
@@ -253,6 +262,7 @@ impl Limits {
                     .ok_or(MultipartError::Payload(PayloadError::Overflow))?,
             );
         }
+
         Ok(())
     }
 }
@@ -260,8 +270,8 @@ impl Limits {
 /// Typed `multipart/form-data` extractor.
 ///
 /// To extract typed data from a multipart stream, the inner type `T` must implement the
-/// [`MultipartFormTrait`] trait, you should use the [`macro@MultipartForm`] macro to derive this for
-/// your struct.
+/// [`MultipartFormTrait`] trait, you should use the [`macro@MultipartForm`] macro to derive this
+/// for your struct.
 ///
 /// Use [`MultipartFormConfig`] to configure extraction options.
 #[derive(Deref, DerefMut)]
@@ -282,42 +292,45 @@ where
     type Future = LocalBoxFuture<'static, Result<Self, Self::Error>>;
 
     #[inline]
-    fn from_request(req: &HttpRequest, payload: &mut Payload) -> Self::Future {
+    fn from_request(req: &HttpRequest, payload: &mut dev::Payload) -> Self::Future {
         let mut payload = Multipart::new(req.headers(), payload.take());
+
         let config = MultipartFormConfig::from_req(req);
         let mut limits = Limits::new(config.total_limit, config.memory_limit);
+
         let req = req.clone();
         let req2 = req.clone();
         let err_handler = config.err_handler.clone();
 
-        async move {
-            let mut state = State::default();
-            // We need to ensure field limits are shared for all instances of this field name
-            let mut field_limits = HashMap::<String, Option<usize>>::new();
+        Box::pin(
+            async move {
+                let mut state = State::default();
+                // We need to ensure field limits are shared for all instances of this field name
+                let mut field_limits = HashMap::<String, Option<usize>>::new();
 
-            while let Some(field) = payload.try_next().await? {
-                // Retrieve the limit for this field
-                let entry = field_limits
-                    .entry(field.name().to_owned())
-                    .or_insert_with(|| T::limit(field.name()));
-                limits.field_limit_remaining = entry.to_owned();
+                while let Some(field) = payload.try_next().await? {
+                    // Retrieve the limit for this field
+                    let entry = field_limits
+                        .entry(field.name().to_owned())
+                        .or_insert_with(|| T::limit(field.name()));
+                    limits.field_limit_remaining = entry.to_owned();
 
-                T::handle_field(&req, field, &mut limits, &mut state).await?;
+                    T::handle_field(&req, field, &mut limits, &mut state).await?;
 
-                // Update the stored limit
-                *entry = limits.field_limit_remaining;
+                    // Update the stored limit
+                    *entry = limits.field_limit_remaining;
+                }
+                let inner = T::from_state(state)?;
+                Ok(MultipartForm(inner))
             }
-            let inner = T::from_state(state)?;
-            Ok(MultipartForm(inner))
-        }
-        .map_err(move |e| {
-            if let Some(handler) = err_handler {
-                (*handler)(e, &req2)
-            } else {
-                e.into()
-            }
-        })
-        .boxed_local()
+            .map_err(move |err| {
+                if let Some(handler) = err_handler {
+                    (*handler)(err, &req2)
+                } else {
+                    err.into()
+                }
+            }),
+        )
     }
 }
 
@@ -378,18 +391,13 @@ impl Default for MultipartFormConfig {
 #[cfg(test)]
 mod tests {
     use actix_http::encoding::Decoder;
-    use actix_http::Payload;
     use actix_multipart_rfc7578::client::multipart;
     use actix_test::TestServer;
-    use actix_web::http::StatusCode;
-    use actix_web::{web, App, HttpResponse, Responder};
+    use actix_web::{dev::Payload, http::StatusCode, web, App, HttpResponse, Responder};
     use awc::{Client, ClientResponse};
 
     use super::MultipartForm;
-    use crate::form::bytes::Bytes;
-    use crate::form::tempfile::Tempfile;
-    use crate::form::text::Text;
-    use crate::form::MultipartFormConfig;
+    use crate::form::{bytes::Bytes, tempfile::Tempfile, text::Text, MultipartFormConfig};
 
     pub async fn send_form(
         srv: &TestServer,
@@ -404,8 +412,7 @@ mod tests {
             .unwrap()
     }
 
-    /// Test `Option` fields
-
+    /// Test `Option` fields.
     #[derive(MultipartForm)]
     struct TestOptions {
         field1: Option<Text<String>>,
@@ -430,8 +437,7 @@ mod tests {
         assert_eq!(response.status(), StatusCode::OK);
     }
 
-    /// Test `Vec` fields
-
+    /// Test `Vec` fields.
     #[derive(MultipartForm)]
     struct TestVec {
         list1: Vec<Text<String>>,
@@ -463,8 +469,7 @@ mod tests {
         assert_eq!(response.status(), StatusCode::OK);
     }
 
-    /// Test the `rename` field attribute
-
+    /// Test the `rename` field attribute.
     #[derive(MultipartForm)]
     struct TestFieldRenaming {
         #[multipart(rename = "renamed")]
@@ -498,8 +503,7 @@ mod tests {
         assert_eq!(response.status(), StatusCode::OK);
     }
 
-    /// Test the `deny_unknown_fields` struct attribute
-
+    /// Test the `deny_unknown_fields` struct attribute.
     #[derive(MultipartForm)]
     #[multipart(deny_unknown_fields)]
     struct TestDenyUnknown {}
@@ -534,22 +538,21 @@ mod tests {
         assert_eq!(response.status(), StatusCode::OK);
     }
 
-    /// Test the `duplicate_action` struct attribute
-
+    /// Test the `duplicate_field` struct attribute.
     #[derive(MultipartForm)]
-    #[multipart(duplicate_action = "deny")]
+    #[multipart(duplicate_field = "deny")]
     struct TestDuplicateDeny {
         _field: Text<String>,
     }
 
     #[derive(MultipartForm)]
-    #[multipart(duplicate_action = "replace")]
+    #[multipart(duplicate_field = "replace")]
     struct TestDuplicateReplace {
         field: Text<String>,
     }
 
     #[derive(MultipartForm)]
-    #[multipart(duplicate_action = "ignore")]
+    #[multipart(duplicate_field = "ignore")]
     struct TestDuplicateIgnore {
         field: Text<String>,
     }
@@ -573,7 +576,7 @@ mod tests {
     }
 
     #[actix_rt::test]
-    async fn test_duplicate_action() {
+    async fn test_duplicate_field() {
         let srv = actix_test::start(|| {
             App::new()
                 .route("/deny", web::post().to(test_duplicate_deny_route))
@@ -600,8 +603,7 @@ mod tests {
         assert_eq!(response.status(), StatusCode::OK);
     }
 
-    /// Test the Limits
-
+    /// Test the Limits.
     #[derive(MultipartForm)]
     struct TestMemoryUploadLimits {
         field: Bytes,
diff --git a/actix-multipart/src/form/tempfile.rs b/actix-multipart/src/form/tempfile.rs
index dd7aee24c..c7d0ad5b6 100644
--- a/actix-multipart/src/form/tempfile.rs
+++ b/actix-multipart/src/form/tempfile.rs
@@ -1,6 +1,7 @@
 //! Writes a field to a temporary file on disk.
 
 use std::{
+    io,
     path::{Path, PathBuf},
     sync::Arc,
 };
@@ -8,11 +9,12 @@ use std::{
 use actix_web::{http::StatusCode, web, Error, HttpRequest, ResponseError};
 use derive_more::{Display, Error};
 use futures_core::future::LocalBoxFuture;
-use futures_util::{FutureExt as _, TryStreamExt as _};
+use futures_util::TryStreamExt as _;
 use mime::Mime;
-use tempfile_dep::NamedTempFile;
+use tempfile::NamedTempFile;
 use tokio::io::AsyncWriteExt;
 
+use super::FieldErrorHandler;
 use crate::{
     form::{tempfile::TempfileError::FileIo, FieldReader, Limits},
     Field, MultipartError,
@@ -23,10 +25,13 @@ use crate::{
 pub struct Tempfile {
     /// The temporary file on disk.
     pub file: NamedTempFile,
+
     /// The value of the `content-type` header.
     pub content_type: Option<Mime>,
+
     /// The `filename` value in the `content-disposition` header.
     pub file_name: Option<String>,
+
     /// The size in bytes of the file.
     pub size: usize,
 }
@@ -39,21 +44,18 @@ impl<'t> FieldReader<'t> for Tempfile {
         mut field: Field,
         limits: &'t mut Limits,
     ) -> Self::Future {
-        async move {
+        Box::pin(async move {
             let config = TempfileConfig::from_req(req);
             let field_name = field.name().to_owned();
             let mut size = 0;
 
-            let file = if let Some(dir) = &config.directory {
-                NamedTempFile::new_in(dir)
-            } else {
-                NamedTempFile::new()
-            }
-            .map_err(|e| config.map_error(req, &field_name, FileIo(e)))?;
+            let file = config
+                .create_tempfile()
+                .map_err(|err| config.map_error(req, &field_name, FileIo(err)))?;
 
             let mut file_async = tokio::fs::File::from_std(
                 file.reopen()
-                    .map_err(|e| config.map_error(req, &field_name, FileIo(e)))?,
+                    .map_err(|err| config.map_error(req, &field_name, FileIo(err)))?,
             );
 
             while let Some(chunk) = field.try_next().await? {
@@ -62,12 +64,13 @@ impl<'t> FieldReader<'t> for Tempfile {
                 file_async
                     .write_all(chunk.as_ref())
                     .await
-                    .map_err(|e| config.map_error(req, &field_name, FileIo(e)))?;
+                    .map_err(|err| config.map_error(req, &field_name, FileIo(err)))?;
             }
+
             file_async
                 .flush()
                 .await
-                .map_err(|e| config.map_error(req, &field_name, FileIo(e)))?;
+                .map_err(|err| config.map_error(req, &field_name, FileIo(err)))?;
 
             Ok(Tempfile {
                 file,
@@ -78,15 +81,14 @@ impl<'t> FieldReader<'t> for Tempfile {
                     .map(str::to_owned),
                 size,
             })
-        }
-        .boxed_local()
+        })
     }
 }
 
 #[derive(Debug, Display, Error)]
 #[non_exhaustive]
 pub enum TempfileError {
-    /// IO Error
+    /// File I/O Error
     #[display(fmt = "File I/O error: {}", _0)]
     FileIo(std::io::Error),
 }
@@ -100,11 +102,20 @@ impl ResponseError for TempfileError {
 /// Configuration for the [`Tempfile`] field reader.
 #[derive(Clone)]
 pub struct TempfileConfig {
-    #[allow(clippy::type_complexity)]
-    err_handler: Option<Arc<dyn Fn(TempfileError, &HttpRequest) -> Error + Send + Sync>>,
+    err_handler: FieldErrorHandler<TempfileError>,
     directory: Option<PathBuf>,
 }
 
+impl TempfileConfig {
+    fn create_tempfile(&self) -> io::Result<NamedTempFile> {
+        if let Some(dir) = self.directory.as_deref() {
+            NamedTempFile::new_in(dir)
+        } else {
+            NamedTempFile::new()
+        }
+    }
+}
+
 const DEFAULT_CONFIG: TempfileConfig = TempfileConfig {
     err_handler: None,
     directory: None,
@@ -138,14 +149,17 @@ impl TempfileConfig {
         } else {
             err.into()
         };
+
         MultipartError::Field {
             field_name: field_name.to_owned(),
             source,
         }
     }
 
-    /// Set the directory tempfiles will be created in.
-    pub fn directory<P: AsRef<Path>>(mut self, dir: P) -> Self {
+    /// Sets the directory that temp files will be created in.
+    ///
+    /// The default temporary file location is platform dependent.
+    pub fn directory(mut self, dir: impl AsRef<Path>) -> Self {
         self.directory = Some(dir.as_ref().to_owned());
         self
     }
@@ -161,13 +175,10 @@ impl Default for TempfileConfig {
 mod tests {
     use std::io::{Cursor, Read};
 
-    use actix_http::StatusCode;
     use actix_multipart_rfc7578::client::multipart;
-    use actix_web::{web, App, HttpResponse, Responder};
+    use actix_web::{http::StatusCode, web, App, HttpResponse, Responder};
 
-    use crate::form::tempfile::Tempfile;
-    use crate::form::tests::send_form;
-    use crate::form::MultipartForm;
+    use crate::form::{tempfile::Tempfile, tests::send_form, MultipartForm};
 
     #[derive(MultipartForm)]
     struct FileForm {
diff --git a/actix-multipart/src/form/text.rs b/actix-multipart/src/form/text.rs
index ae8b3e56e..43e08c335 100644
--- a/actix-multipart/src/form/text.rs
+++ b/actix-multipart/src/form/text.rs
@@ -1,13 +1,13 @@
 //! Deserializes a field from plain text.
 
-use std::sync::Arc;
+use std::{str, sync::Arc};
 
 use actix_web::{http::StatusCode, web, Error, HttpRequest, ResponseError};
 use derive_more::{Deref, DerefMut, Display, Error};
 use futures_core::future::LocalBoxFuture;
-use futures_util::future::FutureExt as _;
 use serde::de::DeserializeOwned;
 
+use super::FieldErrorHandler;
 use crate::{
     form::{bytes::Bytes, FieldReader, Limits},
     Field, MultipartError,
@@ -30,7 +30,7 @@ impl<'t, T: DeserializeOwned + 'static> FieldReader<'t> for Text<T> {
     type Future = LocalBoxFuture<'t, Result<Self, MultipartError>>;
 
     fn read_field(req: &'t HttpRequest, field: Field, limits: &'t mut Limits) -> Self::Future {
-        async move {
+        Box::pin(async move {
             let config = TextConfig::from_req(req);
             let field_name = field.name().to_owned();
 
@@ -42,6 +42,7 @@ impl<'t, T: DeserializeOwned + 'static> FieldReader<'t> for Text<T> {
                     // content type defaults to text/plain, so None should be considered valid
                     true
                 };
+
                 if !valid && config.validate_content_type {
                     return Err(MultipartError::Field {
                         field_name,
@@ -52,36 +53,33 @@ impl<'t, T: DeserializeOwned + 'static> FieldReader<'t> for Text<T> {
 
             let bytes = Bytes::read_field(req, field, limits).await?;
 
-            let text = std::str::from_utf8(bytes.data.as_ref()).map_err(|e| {
-                MultipartError::Field {
-                    field_name: field_name.clone(),
-                    source: config.map_error(req, TextError::Utf8Error(e)),
-                }
+            let text = str::from_utf8(&bytes.data).map_err(|err| MultipartError::Field {
+                field_name: field_name.clone(),
+                source: config.map_error(req, TextError::Utf8Error(err)),
             })?;
 
-            Ok(Text(serde_plain::from_str(text).map_err(|e| {
+            Ok(Text(serde_plain::from_str(text).map_err(|err| {
                 MultipartError::Field {
                     field_name,
-                    source: config.map_error(req, TextError::Deserialize(e)),
+                    source: config.map_error(req, TextError::Deserialize(err)),
                 }
             })?))
-        }
-        .boxed_local()
+        })
     }
 }
 
 #[derive(Debug, Display, Error)]
 #[non_exhaustive]
 pub enum TextError {
-    /// Utf8 error
-    #[display(fmt = "Utf8 decoding error: {}", _0)]
-    Utf8Error(std::str::Utf8Error),
+    /// UTF-8 decoding error.
+    #[display(fmt = "UTF-8 decoding error: {}", _0)]
+    Utf8Error(str::Utf8Error),
 
-    /// Deserialize error
+    /// Deserialize error.
     #[display(fmt = "Plain text deserialize error: {}", _0)]
     Deserialize(serde_plain::Error),
 
-    /// Content type error
+    /// Content type error.
     #[display(fmt = "Content type error")]
     ContentType,
 }
@@ -95,8 +93,7 @@ impl ResponseError for TextError {
 /// Configuration for the [`Text`] field reader.
 #[derive(Clone)]
 pub struct TextConfig {
-    #[allow(clippy::type_complexity)]
-    err_handler: Option<Arc<dyn Fn(TextError, &HttpRequest) -> Error + Send + Sync>>,
+    err_handler: FieldErrorHandler<TextError>,
     validate_content_type: bool,
 }
 
@@ -131,6 +128,7 @@ impl TextConfig {
     }
 
     /// Sets whether or not the field must have a valid `Content-Type` header to be parsed.
+    ///
     /// Note that an empty `Content-Type` is also accepted, as the multipart specification defines
     /// `text/plain` as the default for text fields.
     pub fn validate_content_type(mut self, validate_content_type: bool) -> Self {
@@ -149,13 +147,14 @@ impl Default for TextConfig {
 mod tests {
     use std::io::Cursor;
 
-    use actix_http::StatusCode;
     use actix_multipart_rfc7578::client::multipart;
-    use actix_web::{web, App, HttpResponse, Responder};
+    use actix_web::{http::StatusCode, web, App, HttpResponse, Responder};
 
-    use crate::form::tests::send_form;
-    use crate::form::text::{Text, TextConfig};
-    use crate::form::MultipartForm;
+    use crate::form::{
+        tests::send_form,
+        text::{Text, TextConfig},
+        MultipartForm,
+    };
 
     #[derive(MultipartForm)]
     struct TextForm {
diff --git a/actix-multipart/src/lib.rs b/actix-multipart/src/lib.rs
index 0a15594dd..79c49d822 100644
--- a/actix-multipart/src/lib.rs
+++ b/actix-multipart/src/lib.rs
@@ -8,6 +8,7 @@
 // This allows us to use the actix_multipart_derive within this crate's tests
 #[cfg(test)]
 extern crate self as actix_multipart;
+extern crate tempfile_dep as tempfile;
 
 mod error;
 mod extractor;
diff --git a/actix-multipart/src/server.rs b/actix-multipart/src/server.rs
index ea5eed555..718163344 100644
--- a/actix-multipart/src/server.rs
+++ b/actix-multipart/src/server.rs
@@ -270,7 +270,9 @@ impl InnerMultipart {
                             match field.borrow_mut().poll(safety) {
                                 Poll::Pending => return Poll::Pending,
                                 Poll::Ready(Some(Ok(_))) => continue,
-                                Poll::Ready(Some(Err(e))) => return Poll::Ready(Some(Err(e))),
+                                Poll::Ready(Some(Err(err))) => {
+                                    return Poll::Ready(Some(Err(err)))
+                                }
                                 Poll::Ready(None) => true,
                             }
                         }
@@ -658,7 +660,7 @@ impl InnerField {
                 match res {
                     Poll::Pending => return Poll::Pending,
                     Poll::Ready(Some(Ok(bytes))) => return Poll::Ready(Some(Ok(bytes))),
-                    Poll::Ready(Some(Err(e))) => return Poll::Ready(Some(Err(e))),
+                    Poll::Ready(Some(Err(err))) => return Poll::Ready(Some(Err(err))),
                     Poll::Ready(None) => self.eof = true,
                 }
             }
@@ -673,7 +675,7 @@ impl InnerField {
                     }
                     Poll::Ready(None)
                 }
-                Err(e) => Poll::Ready(Some(Err(e))),
+                Err(err) => Poll::Ready(Some(Err(err))),
             }
         } else {
             Poll::Pending
@@ -794,7 +796,7 @@ impl PayloadBuffer {
         loop {
             match Pin::new(&mut self.stream).poll_next(cx) {
                 Poll::Ready(Some(Ok(data))) => self.buf.extend_from_slice(&data),
-                Poll::Ready(Some(Err(e))) => return Err(e),
+                Poll::Ready(Some(Err(err))) => return Err(err),
                 Poll::Ready(None) => {
                     self.eof = true;
                     return Ok(());
@@ -863,10 +865,12 @@ mod tests {
     use std::time::Duration;
 
     use actix_http::h1::Payload;
-    use actix_web::http::header::{DispositionParam, DispositionType};
-    use actix_web::rt;
-    use actix_web::test::TestRequest;
-    use actix_web::FromRequest;
+    use actix_web::{
+        http::header::{DispositionParam, DispositionType},
+        rt,
+        test::TestRequest,
+        FromRequest,
+    };
     use bytes::Bytes;
     use futures_util::{future::lazy, StreamExt};
     use tokio::sync::mpsc;