Brendan Eich (2015-01-28T19:48:08.000Z)
d at domenic.me (2015-02-13T23:28:36.290Z)
I like the shorter one (filling in from cited text below, here it is in full: [[DefineOwnProperty]] (P, Desc) 1. If _desc_.[[Configurable]] is present and _desc_.[[Configurable]] is *false*, then throw a *TypeError* exception. 2. Return the result of calling the [[DefineOwnProperty]] internal method of _W_ with arguments _P_ and _Desc_. Besides being shorter, this doesn't call through to [[DOP]], which could have effects, and only then maybe-throw.