rails/rails — comment on commit 9cf38be008aff555b3aecc53a6f18800cea30a71
File:  line 0
By sobrinho:

I agree, 1.8 style supports any object as key and 1.9 style not.

Sure we can change when needed but rails projects will be a mix of hash style :(

Maybe is not responsibility of rails handle this but is a good start!