Aaron Jacobs 830fb56728 gmock-actions: improve comments and tests for the implicit cast in Return.
Commit a070cbd91c added an implicit cast to this path but didn't leave a very
clear explanation for why it was desirable, a clear example, or even test
coverage. Add a better comment and a test that fails when the implicit cast is
removed.

PiperOrigin-RevId: 444871311
Change-Id: I127982fa8d5bce9b6d1b68177c12dc0709449164
2022-04-27 08:49:18 -07:00
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