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I've already create an issue about this, I saw another one about "not sorting datas" option and the resolution.
My point is that I have categories representing "Issues statuses" where "New" should comes before "Closed" in the x axis. That is why I would like to be able to disable the sorting feature for datas.
this is useful.. but using something like sortX: false or sort:false instead of passing an empty function is more cleaner...
btw thanks for this, I will use your repo until this gets merged
Fixes #39: using method to sort datas