Fibrous breaks options.sync check

[gavinaiken]

The issue is that fibrous adds a sync function to Object.prototype so when glob creates an empty object for its options, sync is truthy on that new options object.

> var obj = {};
> console.log(obj.sync);
// undefined
> var fibrous = require('fibrous');
> var obj = {};
> console.log(obj.sync);
// { that: {} }
> var obj = Object.create(null)
> console.log(obj.sync);
// undefined

This is really more fibrous's issue than glob's, but there is a simple fix in glob, so I wanted to see if you would be willing to accept a PR for it. e.g. we could change:

if (typeof options === 'function') cb = options, options = {}

to:

if (typeof options === 'function') cb = options, options = Object.create(null)

Happy to submit a PR if you would consider it...

Also see issue goodeggs/fibrous#41 in fibrous.

[isaacs]

No longer relevant in v9.