'input:text' selector not finding input element with no type attribute

As recently as 1.4.3 $('input:text') would find input elements with no type attribute, but after upgrading to 1.5.1 that is no longer the case.

Is this a bug or an intended refactor to be more standards compliant?

FYI - this is the selector I now have to use: $('input:text, input:not([type])')