An offline discussion with RW identified this as a spec bug. Filed here: https://bugs.ecmascript.org/show_bug.cgi?id=1587
On Tue, Jul 16, 2013 at 4:08 PM, Jeremy Martin <[email protected]> wrote: > I referenced Function.length instead of Function#length. Here's the > actually relevant spec [1]: > > The value of the length property is an integer that indicates the typical > number of arguments expected by the function. However, the language permits > the function to be invoked with some other number of arguments. The > behaviour of a function when invoked on a number of arguments other than > the number specified by its length property depends on the function. This > property has the attributes { [[Writable]]: false, [[Enumerable]]: false, > [[Configurable]]: false }. > > > Everything else still applies. (Hopefully) goes without saying, but the > same should apply to GeneratorFunction instances as well [2]. > > [1] http://people.mozilla.org/~jorendorff/es6-draft.html#sec-15.3.4.1 > [2] http://people.mozilla.org/~jorendorff/es6-draft.html#sec-15.19.3.4 > > > On Tue, Jul 16, 2013 at 3:53 PM, Jeremy Martin <[email protected]> wrote: > >> This is a resurrection of an earlier proposal from Nathan Wall [1], that >> would make Function.length configurable. The initial proposal was to make >> it writable, but configurable instead was suggested by Claude Pache [2]. >> >> Nathan's original post [1] does a good job of outlining the motivation, >> so I won't reiterate them here. From what I can gather, making >> Function.length configurable seemed to receive a positive response [3] [4] >> [5], but the thread apparently died. Perhaps I just need to find a new API >> paradigm, but I run into this issue on a regular basis writing callback >> utilities, and would be very interested in seeing this move forward. >> >> For convenience, the Function.length spec from the latest draft [6]: >> >> This is a data property with a value of 1. This property has the >> attributes { [[Writable]]: false, [[Enumerable]]: false, [[Configurable]]: >> false }. >> >> >> [1] http://www.mail-archive.com/[email protected]/msg21786.html >> [2] http://www.mail-archive.com/[email protected]/msg21792.html >> [3] http://www.mail-archive.com/[email protected]/msg21793.html >> [4] http://www.mail-archive.com/[email protected]/msg21794.html >> [5] http://www.mail-archive.com/[email protected]/msg21795.html >> [6] http://people.mozilla.org/~jorendorff/es6-draft.html#sec-15.3.2.2 >> >> Thanks, >> >> -- >> Jeremy Martin >> 661.312.3853 >> http://devsmash.com >> @jmar777 >> > > > > -- > Jeremy Martin > 661.312.3853 > http://devsmash.com > @jmar777 > -- Jeremy Martin 661.312.3853 http://devsmash.com @jmar777
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