- From: Boris Zbarsky <web-platform-tests-notifications@w3.org>
- Date: Fri, 13 Mar 2015 04:44:53 GMT
- To: public-web-platform-tests-notifications@w3.org
Per the Web IDL spec, the conversion to DOMString is done by invoking ToString
as defined at
<http://people.mozilla.org/~jorendorff/es6-draft.html#sec-tostring>. This is
also what
http://people.mozilla.org/~jorendorff/es6-draft.html#sec-string-constructor-string-value
does when called without new.
On the other hand, ""+v as currently used in the test invokes ToPrimitive on
both sides of the addition before invoking ToString on the right-hand side.
For the particular value { valueOf:function() {return 3;} }, ToPrimitive
returns the number 3, so ""+{ valueOf:function() {return 3;} } == "3".
But ToString() on that same value invokes ToPrimitive with the "String" hint,
which will try toString() before trying valueOf(). So ToString({
valueOf:function() {return 3;} }) is "[object Object]", which is not at all the
same thing as "3".
View on GitHub: https://github.com/w3c/web-platform-tests/pull/1673
Received on Friday, 13 March 2015 04:45:03 UTC