MAINT: use constants for nat
MAINT: use constants for nat

alphaBenj/zipline,enigmampc/catalyst,florentchandelier/zipline,alphaBenj/zipline,umuzungu/zipline,humdings/zipline,wilsonkichoi/zipline,wilsonkichoi/zipline,magne-max/zipline-ja,magne-max/zipline-ja,Scapogo/zipline,nborggren/zipline,florentchandelier/zipline,quantopian/zipline,nborggren/zipline,umuzungu/zipline,humdings/zipline,bartosh/zipline,bartosh/zipline,quantopian/zipline,enigmampc/catalyst,Scapogo/zipline