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Ensure `HashWithIndifferentAccess#transform_keys` to return `HashWithIndifferentAccess` #30728
I think that
…IndifferentAccess` Currently, `#transform_values`, `#select` and `#reject` return instance of `HashWithIndifferentAccess`. But `#transform_keys` returns instance of Hash. This behavior is a bit confusing. I think that `HashWithIndifferentAccess#transform_keys` should also return instance of `HashWithIndifferentAccess` as well as other methods.
The test of
I feel that