fix: Freezing of Map values during finalization #1150
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Map keys are not enumerable properties of the Map object, so the propertyIsEnumerable check does not apply to them. This commit adds a condition to detect Map objects and uses Map.prototype.has to check for key existence. Fixes immerjs#1119.
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Findings
Map keys are not enumerable properties of the Map object, so the
propertyIsEnumerablecheck does not apply to them.This fails the check in
finalizePropertyofsrc/core/finalize.ts.Changes
Mapobjects and usesMap.prototype.hasto check for key existence.Fixes #1119