rails/rails — pull request #7590 by bkuo (2012-09-10 17:01:45+00:00)
Title: Fixes _field_changed?

When a non-empty string that casts to zero is assigned to a number column already containing zero, then _field_changed? should not become true.

Fixes a bug(?) introduced some time in 3.2
(It is working in 3.0.15, but broken in 3.2.8)