Remove an unnecessary cast. (#296)
Remove an unnecessary cast. (#296)

* Remove an unnecessary cast.

Also add an analysis_options file to enable strong mode for everyone
who hacks on quiver.

* Don't add analysis-options file since it isn't clean on stable yet.

willyp564/quiver-dart,kevmoo/quiver-dart,google/quiver-dart,jtmcdole/quiver-dart,kevmoo/quiver-dart,jtmcdole/quiver-dart,cbracken/quiver-dart,willyp564/quiver-dart,cbracken/quiver-dart