Looks like the Rails 3.2 update drags along a few other unrelated changes, although they appear to be fairly minor:
https://github.com/rails/rails/compare/v3.2.18...v3.2.19
as compared to: https://github.com/rails/rails/compare/v4.1.2...v4.1.3 and https://github.com/rails/rails/compare/v4.0.6...v4.0.7