What is jQuery (edge) in jsfiddle.net?

In jsfiddle.net if one choose framework as jQuery or Mootools they will get an option for choosing jQuery ( edge ) and Mootools( edge ).

I googled it quite a bit but did not get any good answers. My questions are

1. Wha开发者_JS百科t are those versions?
2. How are they useful to the fiddle creator?

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It is the jQuery nightly build from github...

jQuery JavaScript Library v1.6.3pre Live From Git (b22c9046529852c7ce567df13397849e11e2b9cc)

Here is the link: link (jsfiddle uses this)

Here is the jQuery github link: github-link

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An edge build usually refers to some kind of "nightly" or not yet released build. The cutting edge, basically the latest source packaged up.