ng-required not working with simple boolean in 1.7.6 (works in 1.7.5)

[jmerrillstg]

I'm submitting a ...

• bug report
• feature request
• other

Current behavior:

ng-required="!foo" still marks the field required if foo===true but ng-required="{false: 'true'}[foo]" works as expected.

Expected / new behavior:

Minimal reproduction of the problem with instructions:

see above, it's pretty simple

AngularJS version: 1.x.y

version 1.7.6 - works fine in 1.7.5

Browser: [all | Chrome XX | Firefox XX | Edge XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView | Opera XX ]

all browsers

Anything else:

I guess I might explain why I am even using it this way. a bunch of fields are created by an ng-repeat and I don't want the last field requied so I was using ng-required="!$last" which worked in 1.7.5 but is now broken in 1.7.6 and I tried a bunch of stuff and narrowed it down to it just not liking anything with the !

[gkalpak]

Duplicate of #16814. The fix will land in v1.7.7.