emberjs/data — pull request #2524 by kellyselden (2014-11-27 18:33:54+00:00)
Title: use defaultValue without supplying type

I prefer to use `DS.attr()` without a type when possible, but when I
want to use a defaultValue, I must supply a type. This would make it so
that you can supply a defaultValue, but still have an attribute without
a transform.