<commit_before># Unreleased 
- [changed] Firestore now limits the number of concurrent document lookups it
  will perform when resolving inconsistencies in the local cache (#1374).
- [fixed] Fixed a performance regression introduced by the addition of<commit_msg>Add TODO. (#1442)<commit_after># Unreleased

# 21.4.3
- [changed] Firestore now limits the number of concurrent document lookups it
  will perform when resolving inconsistencies in the local cache (#1374).

# 21.4.2
- [changed] Removed Guava dependency from the SDK. This change is the first
  step in eliminating crashes caused by apps that depend on the wrong flavor of
  Guava (#1125).

# 21.4.1
- [fixed] Fixed a performance regression introduced by the addition of
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