The bind 'polyfill' is incomplete

[mako-taco]

Deleting Function.prototype.bind and replacing it with a non-working polyfill causes conflicts with other libraries for no good reason. The bind polyfill provided by mootools does not account for appended arguments that are bound to a function.

You can see an example on jsfiddle.

[DimitarChristoff]

technically, it's not a polyfill as MooTools' bind pre-dates the standardisation of Fn.proto.bind

because of that, it differs. it's now a protected method but for compat's sake, it can also remain broken :)

please see #2473 - just stop using the compatibility build version of mootools.

https://jsfiddle.net/dimitar/z1f12s6p/1/ - your fiddle with the right version of mootools (https://ajax.googleapis.com/ajax/libs/mootools/1.5.1/mootools-nocompat-yui-compressed.js)

[arian]

MooTools added Function.prototype.bind in like 2006, before it existed in ES5. Unfortunately that version is incompatible with ES5 .bind.

However we fixed that in version 1.3 a few years ago. The old behavior is only there to provide compatibility with old MooTools scripts.

In the default download on mootools.net, this compat layer is disabled by default.

So if you use the right (default) build, it will work fine, as it should.