On 10/27/15 4:35 AM, Claude Pache wrote:
it is that, for any callable object, it will return a string and not throw,
because it was so since the dawn of JS.
It's totally false for random "host objects" with a [[Call]] in ES5, per
spec and in at least some implementations. As you can tell in Firefox
for example:
Function.prototype.toString.call(document.createElement("object"))
(though it does not throw for document.all in Firefox, for interesting
implementation reasons).
That function will work (in the sense of: will return an answer; I'm not judging the quality of
that answer) with anything reasonable fed to it (where "reasonable" excludes things like
`(class { static toString() { throw "pwnd!" }})`).
Won't work with an HTMLObjectElement in at least some browsers. How
"reasonable" that is, who knows.
-Boris
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