Map<'Key, 'Value, 'ComparerTag>
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Immutable maps. Keys are ordered by construction function specified
when creating empty maps or by F# structural comparison if no
construction function is specified.
Maps based on structural comparison are
efficient for small keys. They are not a suitable choice if keys are recursive data structures
or require non-structural comparison semantics.
Immutable maps. A constraint tag carries information about the class of key-comparers being used.
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