DOC: `group_by_type` returns a regular dict.
DOC: `group_by_type` returns a regular dict.

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