Treat empty and uninitialized Maps the same in equality checks #638
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Treat an empty Map the same as an uninitialized Map when performing equality checks. This ensures that reading a map field does not alter the hashCode or equality comparison of the message itself.
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Treat an empty Map the same as an uninitialized Map when performing equality
checks. This ensures that reading a map field does not alter the hashCode or
equality comparisons of the message itself.
Rebased version #591 with a regression test.
cl/304375641