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Add some more reserved type annotations 

I think it would be useful to get these few more common data types into 
For the decimal floating types, I referenced [this protobuf discussion](https://github.com/protocolbuffers/protobuf/pull/7039#issuecomment-679083593) and [this](https://github.com/googleapis/googleapis/blob/master/google/type/decimal.proto)

I'm not sure what to call out for the currency format, I can't find a standard for that yet. There's a [protobuf money type](https://github.com/googleapis/googleapis/blob/master/google/type/money.proto) that's basically a ISO 4217 currency code plus a decimal number, but I don't really want to invent a suggested money format if there's a real one out there somewhere.
For this PR, can we just leave it TBD in order to reserve the type keyword?
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Eric Sampson 2021-09-08 21:27:12 -05:00 committed by GitHub
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@ -236,16 +236,26 @@ Platform-dependent integer types, both signed and unsigned:
* `isize`
* `usize`
#### Reserved Type Annotations for Numbers With Decimals:
IEEE 754 floating point numbers, both single (32) and double (64) precision:
* `f32`
* `f64`
IEEE754-2008 decimal floating point numbers
* `decimal64`
* `decimal128`
#### Reserved Type Annotations for Strings:
* `date-time`: ISO8601 date/time format.
* `time`: "Time" section of ISO8601.
* `date`: "Date" section of ISO8601.
* `duration`: ISO8601 duration format.
* `decimal`: IEEE754-2008 decimal string format.
* `money`: TBD
* `email`: RFC5302 email address.
* `idn-email`: RFC6531 internationalized email address.
* `hostname`: RFC1132 internet hostname.