> I would appreciate to add includes? and contains?,
> because thats the default usage - and better English

This has always bugged me, too, and for once I did the sensible thing and looked to see if anyone had raised an issue for it.

They did, five years ago. It was rejected and the reasons are not awful ones: https://bugs.ruby-lang.org/issues/5555

TL;DR: a general rule to avoid third person singular.  (although, ahem, `has_key?`)


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