HashMap<K, V>.identity constructor
Creates an unordered identity-based map.
Effectively a shorthand for:
HashMap<K, V>(equals: identical, hashCode: identityHashCode)
Implementation
external factory HashMap.identity();
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.13.0/dart-collection/HashMap/HashMap.identity.html