Drop support for IE < 11

[jdalton]

Tie-in issue to Backbone issue #3828.

On Jan 12, 2016 MS is essentially dropping support for IE8. With that in mind jQuery and Lodash are dropping IE8 support in their 3.0 and 4.0 releases. So let's discuss dropping it in the next major bump of Underscore.

[akre54]

👍 What would that entail? Object.create is finally supported, as are most of the Array.prototype methods, but we dropped those already.

[jdalton]

It would mean dropping hasEnumBug fixes in _.keys and _.allKeys, dropping the shift and splice fixes in the array wrapper assignments, dropping the isArguments fallback, and simplifying isArray.

[akre54]

In theory I'm in favor. You probably should be using es5shim/es5sham if you need the older browsers anyways.

[jridgewell]

👍

[jdalton]

In theory I'm in favor. You probably should be using es5shim/es5sham if you need the older browsers anyways.

That's how I'm approaching it with Lodash. I make sure that my usage has a compat path with es5shim and es6shim. I assume folks wanting older IE support will be using those already.

Is there a living document somewhere that states what browsers are supported by Underscore?

[jgonggrijp]

Reminder to self: _.delay is essentially a ponyfill for setTimeout in IE < 10 (where setTimeout doesn't support passing additional arguments), so it can be changed into just an alias to setTimeout when we implement this.

@jehrenzweig

Is there a living document somewhere that states what browsers are supported by Underscore?

Since version 1.12, there is: https://underscorejs.org/#compatibility.