This has been requested countless times, then rejected each and every time.
See also https://bugs.ruby-lang.org/issues/5555

2017-10-05 1:11 GMT+09:00 Alberto Almagro <albertoalmagro / gmail.com>:
> Hello,
>
> this was mentioned at Euruko's conference by Bozhidar Batsov and fully
> resonated with my own personal experience using Ruby. As I tweeted after the
> conference I would like to contribute to make Ruby better, and aliasing
> Enumerable#include? with Enumerable#includes? would be a great start. I
> simply can't remember how many times I have written includes? instead of
> include? Last Saturday I definitely confirmed that I'm not the only one.
> What do you think?
>
> If possible I offer me volunteer to write and submit the patch myself.
>
> Thanks!
> Alberto
>
>
> Unsubscribe: <mailto:ruby-core-request / ruby-lang.org?subject=unsubscribe>
> <http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>
>

Unsubscribe: <mailto:ruby-core-request / ruby-lang.org?subject=unsubscribe>
<http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>