montagejs/collections — pull request #72 by kriskowal (2014-05-15 00:47:33+00:00)
Title: Ignore property changes on non-configurables

In Safari, properties of hosted objects (particularly DOM elements) are
not configurable so observing a property on a DOM element, even if to
traverse to an observable object, would fail with an error. This change
allows observers to proceed on the assumption that the non-configurable
property will not be changed.

This change fixes https://github.com/kriskowal/tengwarjs/issues/1