Commented Unassigned: MaskedEditExtender's ClearMaskOnLostFocus does not work [27427]

Using as an example of starting the April 30 version 4.1.7.0429 version AjaxControlToolkitSampleSite.zip shifting the focus on the textbox the page is not erased the mask, the result is visible in the attached figure.
Comments: This new bug was introduced on May 01, 2013, with the comment "fixed issue of MaskedEditExtender with ClearMaskOnLostFocus and with MaskedEditValidator with ClientValidationFunction." to "fix" this ticket: https://ajaxcontroltoolkit.codeplex.com/workitem/15492 Changeset here: https://ajaxcontroltoolkit.codeplex.com/SourceControl/changeset/f93bf51e71052b12b0751b51f14468ffd496c37b My fix for this new bug (27427) is to simply revert the changes made in MaskedEditBehavior.pre.js back in May 2013 (seen in the changeset above) in my own build of the toolkit as I'm not affected by bug 15492.