Issue #12512 has been updated by Matthew Kerwin.


Incidentally, as discussed back in #7793, the [hashmap](https://rubygems.org/gems/hashmap) gem defines #map_keys, #map_values, and #map_pairs, and their bang variants.

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Feature #12512: Import Hash#transform_values and its destructive version from ActiveSupport
https://bugs.ruby-lang.org/issues/12512#change-60101

* Author: Kenta Murata
* Status: Open
* Priority: Normal
* Assignee: Kenta Murata
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I think value transformation is a fundamental feature of Hash.



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