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由 yuuji.yaginuma 提交于
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.
de9e3238
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