It would be awesome if this library acted a bit more like a serverside polyfill for FormData in the browser.
I am very willing to create PR's for the items below. (Hopefully with help).

Here are a list of things that are currently missing (Feel free to comment more):

Existing Methods

• FormData.append(String: field, String: value, Object: options)
• Should allow for options to be a String that is the file name.
  https://dvcs.w3.org/hg/xhr/raw-file/tip/Overview.html#dom-formdata-append
• FormData.delete(String: field)
• FormData.entries()
• FormData.get(String: field)
• FormData.getAll()
• FormData.has()
• FormData.keys()
• FormData.set(String: field, String: value, Object: options)
• FormData.values()

Other

• Expose global FormData
• Taken care of by isomorphic-form-data.
• Support for blobs
• Currently this is not supported - not sure if it's needed.
• Polyfill in browser.js
• Browser.js simply returns "FormData" currently. Perhaps we could consider adding a polyfill for the browser instead. Something like https://gist.github.com/Rob--W/8b5adedd84c0d36aba64.
  This may be out of scope.