another optimization for .flatMap(x => constant(x)) case
another optimization for .flatMap(x => constant(x)) case

AgentME/kefir,hsavit1/kefir,AyaMorisawa/kefir,pixelpicosean/kefir,lautis/kefir,elsehow/kefir,lautis/kefir,elsehow/kefir,kelsadita/kefir,AgentME/kefir,AyaMorisawa/kefir,hsavit1/kefir,pixelpicosean/kefir,kelsadita/kefir