diff --git a/lib/algorithm.js b/lib/algorithm.js
index ad3f3a7..df231ce 100644
--- a/lib/algorithm.js
+++ b/lib/algorithm.js
@@ -1,7 +1,7 @@
 const { BloomFilter } = require('bloom-filters')
 const MsgV3 = require('ppppp-db/msg-v3')
 const p = require('util').promisify
-const { isEmptyRange, estimateMsgCount } = require('./range')
+const { EMPTY_RANGE, isEmptyRange, estimateMsgCount } = require('./range')
 const { parseGoal } = require('./goal')
 
 /**
@@ -27,7 +27,7 @@ class Algorithm {
 
   haveRange(rootID) {
     const rootMsg = this.#peer.db.get(rootID)
-    if (!rootMsg) return [1, 0]
+    if (!rootMsg) return EMPTY_RANGE
     let minDepth = Number.MAX_SAFE_INTEGER
     let maxDepth = 0
     for (const rec of this.#peer.db.records()) {
@@ -62,7 +62,7 @@ class Algorithm {
   #wantNewestRange(localHaveRange, remoteHaveRange, count) {
     const [minLocalHave, maxLocalHave] = localHaveRange
     const [minRemoteHave, maxRemoteHave] = remoteHaveRange
-    if (maxRemoteHave <= maxLocalHave) return [1, 0]
+    if (maxRemoteHave <= maxLocalHave) return EMPTY_RANGE
     const maxWant = maxRemoteHave
     const size = Math.max(maxWant - maxLocalHave, count)
     const minWant = Math.max(maxWant - size, maxLocalHave + 1, minRemoteHave)
@@ -87,8 +87,8 @@ class Algorithm {
    * @returns {Range}
    */
   wantRange(localHave, remoteHave, goal) {
-    if (!goal) return [1, 0]
-    if (isEmptyRange(remoteHave)) return [1, 0]
+    if (!goal) return EMPTY_RANGE
+    if (isEmptyRange(remoteHave)) return EMPTY_RANGE
     const { type, count } = parseGoal(goal)
     if (type === 'all') {
       return this.#wantAllRange(localHave, remoteHave)
@@ -148,7 +148,7 @@ class Algorithm {
     const tangle = this.#peer.db.getTangle(rootID)
     const sorted = tangle.topoSort()
     if (sorted.length <= count) return
-    const msgID = sorted[sorted.length - count]
+    const msgID = sorted[sorted.length - count] // New "oldest dataful msg"
     const { deletables, erasables } = tangle.getDeletablesAndErasables(msgID)
     const del = p(this.#peer.db.del)
     const erase = p(this.#peer.db.erase)
diff --git a/lib/range.js b/lib/range.js
index da808f9..0f8aec8 100644
--- a/lib/range.js
+++ b/lib/range.js
@@ -23,7 +23,10 @@ function estimateMsgCount(range) {
   else return estimate
 }
 
+const EMPTY_RANGE = [1, 0]
+
 module.exports = {
   isEmptyRange,
   estimateMsgCount,
+  EMPTY_RANGE
 }