Add documentation on ids needing to be strings
Add documentation on ids needing to be strings

This closes https://github.com/select2/select2/issues/4052
This closes https://github.com/select2/select2/pull/4076
This closes https://github.com/select2/select2/issues/4227

fk/select2,NabiKAZ/select2,select2/select2,bottomline/select2,NabiKAZ/select2,select2/select2,megahallon/select2,ZaArsProgger/select2,michael-brade/select2,ZaArsProgger/select2,megahallon/select2,bottomline/select2,iestruch/select2,inway/select2,iestruch/select2,michael-brade/select2,inway/select2,murb/select2,fk/select2,murb/select2