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Proc responds to
instance_exec
since forever ago.Official Ruby docs only go back to 2.0, so I added that as the minimum version, if someone should for some reason still use rubies before that.
https://docs.ruby-lang.org/en/2.0.0/BasicObject.html#method-i-instance_exec
Stumbled over this because of rubocop/rubocop-performance#464. The next version will be 3.0.0, seems appropriate to drop in a major version.