I actually wasnt planning on publishing this, but now that you said that, i feel like i would be squadering what i wrote since it could be useful to other users. Forked and now republished with the changes requested.

I didnt realize i published this kumite, apologies. Was using this as a way to test how flatmap worked (which as you noted is not correct way) in comparison to filter approach and how kata template (including giving it a shot at updating tests) worked. thanks for the heads up im fine with a reject on this.