coll added to Str. Closes #2434
coll added to Str. Closes #2434

tbrowder/doc,MasterDuke17/doc,perl6/doc,MasterDuke17/doc,tbrowder/doc,MasterDuke17/doc,perl6/doc,perl6/doc,perl6/doc,tbrowder/doc,perl6/doc,tbrowder/doc,MasterDuke17/doc