[BUG] ng-repeat filter true

[exejutable]

What is the current behavior?

On ng-repeat filter: model : true (strict) If i do a filter in the array and then cleaned the input, it does not return to normal state (not filtered)

Angular version
1.4.9

Link to reproduce the bug

http://plnkr.co/edit/my0ilXPu7aTUIiKxOI4n?p=preview

Steps

• Filter in the input (the array filter correctly)
• Clean the input (the array does not return to the previus state (not filtered)

What is the expected behavior?

I suppose the expected behavior is return the ng-repeat array complete (not filtered).

[gkalpak]

This is expected behavior. It happens because initially the expression is undefined, but when you clear the field it is an empty string (and undefined !== '').
See #12060 for more context and possible work-arounds.