Documentation of inputFiles seems incorrect

[BryanCrotaz]

Readme says inputFiles is an array:

options = options || {};
// options.inputFiles === array of globs, to consider for the cache key

However looking into the code, the default is an empty hash:

this._inputFiles = options.inputFiles || {};

At the least these two don't agree with each other - which one is correct?

[Turbo87]

that seems to be a bug in the documentation, but I haven't found any code using this option yet to verify how to use it correctly...

[kylecordes]

Experimentally, it is an array: if you pass it an array of nodes (I've only ever tried with one), it works. If you pass it a single node, it fails with an error. I suspect that bit of code mentioned above is simply a bug which is never hit during correct use.