Back port safer progress wrapper for chain
Back port safer progress wrapper for chain

tkirda/when,mlennon3/when,frank-weindel/when,caporta/when,SourcePointUSA/when,frank-weindel/when,petkaantonov/when,caporta/when,tkirda/when,anthonyvia/when,stevage/when,anthonyvia/when,stevage/when,SourcePointUSA/when,mlennon3/when,ning-github/when,DJDNS/when.js,ning-github/when