Issue #260 has been updated by Yukihiro Matsumoto.

Status changed from Open to Rejected
Assigned to set to Yukihiro Matsumoto

I see no reason to have String#crypt!
Having a bang method for each string method is just insane.
you need a better reason than consistency to introduce a new method.
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http://redmine.ruby-lang.org/issues/show/260

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