We'd have preferred a more responsible disclosure, and I hope he (and others) are more careful about this in the future. Most reporters we get act very responsible, and we are always gracious (and even contract work from them in some cases) In his case, we saw activity that he didn't report to us, and suspended his account while we did a deeper investigation.
The Rails community and we still think that his proposed solution is not a good idea, but it did provoke exploration in some other ideas.
https://github.com/rails/rails/issues/5228
http://techno-weenie.net/2012/3/19/ending-the-mass-assignmen...