We want to publish a new version of fixnum w/ the new sdk min. of 2.19 (see dart-archive/fixnum#99). We have other work that we want to land in a timely manner (dart-archive/fixnum#100); we'll plan to do the (minor) work to publish a 2.19 version in a branch (updating from 1.1.0-dev to 1.1.0).