optional `comparator` parameter in `$filter('filter')(array, expression, comparator, anyPropertyKey)`

[ranjan-2209]

In this website: https://docs.angularjs.org/api/ng/filter/filter, comparator parameter is optional in $filter('filter')(array, expression, comparator, anyPropertyKey)

[gkalpak]

Listing undefined as one of the possible values is an unorthodox way of saying it is optional, I guess.
If someone wants to submit a PR to properly mark it as optional (and mention that it defaults to false), I would be happy to merge 😄

[ranjan-2209]

Also, default value is false.

[gkalpak]

That's what I said 😃

[kylewuolle]

I submitted a PR 15371 for this!

[ranjan-2209]

this isn't showing in docs?