553106 - Allow "duck typing" on COWs

Status: RESOLVED WONTFIX

(Core :: XPConnect, defect)

Description

[Blake Kaplan (:mrbkap) (inactive)]

It would be useful to allow content to do duck typing or capabilities type tests:

if (cow.feature) {
  ...cow.feature()...
}

right now, the test throws... These properties should return undefined and not be "in" the cow (i.e. "nonExposedFeature in cow" should return false).

Comment 1

[Blake Kaplan (:mrbkap) (inactive)]

Attachment: testcase

This testcase should do toSource.

Comment 2

[Blake Kaplan (:mrbkap) (inactive)]

All the COWs went to the slaughterhouse.