Creates an identity map with the default implementation, LinkedHashMap.
An identity map uses identical for equality and identityHashCode for hash codes of keys instead of the intrinsic Object.operator==
and Object.hashCode of the keys.
The returned map allows null
as a key. It iterates in key insertion order.
factory Map.identity() = LinkedHashMap<K, V>.identity;
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.5.0/dart-core/Map/Map.identity.html