Improve the detection of global/root object

[megawac]

Refer to jashkenas/underscore#2152. We were using a similar approach to asyncs current one in underscore until jashkenas/underscore#2153.

The two main benefits of this change are:

• Forwards compatibility with strict mode and some tooling (see Use Function("return this") to get global? jashkenas/underscore#2152)
• WebWorker support, you can't use window in a WebWorker but you can use self

Aside: here's the detection method from lodash

[aearly]

Should we explicitly check for window? If async.js gets wrapped in something that adds strict mode, this in the check will be null.

[megawac]

Self covers that case
On Jun 24, 2015 6:11 PM, "Alexander Early" notifications@github.com wrote:

Should we explicitly check for window? If async.js gets wrapped in
something that adds strict mode, this in the check will be null.

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#804 (comment).

[aearly]

OK, cool. 👍