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Add tests to guarantee no need copyOf map
I added tests to guarantee that unnecessary maps are not created given some possibles performance issues mentioned here #3467. Though I was not able to create a test scenario to simulate the issue. So, opening this PR to have at least some explicit tests narrowing this behavior.
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hello @cpovirk, do you think that is worth to merge those tests? otherwise, we can close the PR.
@cpovirk do you think it's worthy to add those tests or should we close it?