- From: Boris Zbarsky <notifications@github.com>
- Date: Fri, 20 Nov 2015 16:50:09 -0800
- To: heycam/webidl <webidl@noreply.github.com>
Received on Saturday, 21 November 2015 00:50:38 UTC
> Would it be possible to say something like "when an ECMAScript value is not supplied for the > argument, the corresponding Web IDL value is the empty dictionary"? Sure. We already say something like that that for dictionaries in trailing position, as I noted. > although if there are cases where {} and undefined are treated differently, then I guess we are in trouble The only cases where that happens are: 1. A union which contains a dictionary and the default value is a value for one of the other types in the union. But then conversion from IDL to JS would produce that default value, not undefined. 2. If someone adds properties on `Object.prototype`, because `undefined` always produces an empty dictionary while `{}` would then possibly produce a nonempty one. But that would be a problem for arguments too; people should just not add properties on `Object.prototype` because that kills puppies. --- Reply to this email directly or view it on GitHub: https://github.com/heycam/webidl/issues/76#issuecomment-158568396
Received on Saturday, 21 November 2015 00:50:38 UTC