lifo/docrails — pull request #122 by ColinDKelley (2012-12-26 22:30:24+00:00)
Title: removed TIP: :allow_nil/:allow_blank is ingored by the presence validator

These tips were documenting an inconsistency issue https://github.com/rails/rails/issues/8621. that issue is resovled by https://github.com/rails/rails/pull/8622.