Allow transformer to change type.
Allow transformer to change type.

QuiverDart/quiver_strings,willyp564/quiver-dart,yjbanov/quiver_hashcode,QuiverDart/quiver_mirrors,matgray/quiver_iterables,QuiverDart/quiver_hashcode,googlearchive/quiver_hashcode,googlearchive/quiver_pattern,EmmanuelOga/quiver-dart,googlearchive/quiver_async,QuiverDart/quiver_async,jtmcdole/quiver-dart,QuiverDart/quiver_iterables,kevmoo/quiver-dart,yjbanov/quiver_async,QuiverDart/quiver_collection,cbracken/quiver-dart,QuiverDart/quiver_check,googlearchive/quiver_time,googlearchive/quiver_optional,QuiverDart/quiver_pattern,googlearchive/quiver_check,googlearchive/quiver_collection,QuiverDart/quiver_io,googlearchive/quiver_iterables,googlearchive/quiver_time,kevmoo/quiver-dart,QuiverDart/quiver_hashcode,QuiverDart/quiver_mirrors,matgray/quiver_iterables,googlearchive/quiver_mirrors,QuiverDart/quiver_cache,willyp564/quiver-dart,googlearchive/quiver_iterables,googlearchive/quiver_mirrors,jtmcdole/quiver-dart,yjbanov/quiver_async,QuiverDart/quiver_io,QuiverDart/quiver_cache,yjbanov/quiver_hashcode,trinarytree/quiver-dart,googlearchive/quiver_pattern,googlearchive/quiver_async,googlearchive/quiver_cache,QuiverDart/quiver_pattern,googlearchive/quiver_strings,QuiverDart/quiver_collection,googlearchive/quiver_collection,cbracken/quiver-dart,EmmanuelOga/quiver-dart,QuiverDart/quiver_async,QuiverDart/quiver_check,trinarytree/quiver-dart,QuiverDart/quiver_time,alechenninger/quiver-dart,googlearchive/quiver_optional,googlearchive/quiver_hashcode,googlearchive/quiver_io,googlearchive/quiver_check,googlearchive/quiver_strings,google/quiver-dart,QuiverDart/quiver_time,QuiverDart/quiver_optional,alechenninger/quiver-dart,QuiverDart/quiver_iterables,QuiverDart/quiver_optional,googlearchive/quiver_io,googlearchive/quiver_cache,QuiverDart/quiver_strings