Updates:
Status: WorkingAsIntended
Owner: [email protected]
Labels: Type-Bug Harmony
Comment #1 on issue 2832 by [email protected]: Proxy invariant errors
confusingly ignore toString
http://code.google.com/p/v8/issues/detail?id=2832
This is actually working as intended. We can't allow formatting an error
message to invoke a user-defined toString, since that may have observable
side effects. That was a security bug we fixed some time ago, though after
this error message was designed. The information is perhaps confusing now,
but the string can still be useful, e.g. if you construct the handler from
a constructor function:
function MyHandler() {}
MyHandler.prototype.getOwnPropertyDescriptor = function() { return
{value: 0} }
Object.getOwnPropertyDescriptor(Proxy.create(new MyHandler), 'x')
==> TypeError: Proxy handler #<MyHandler> returned non-configurable
descriptor for property 'x' from 'getOwnPropertyDescriptor' trap
Same applies to all other errors outputting objects.
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