it is not really so much a difference, as much as it is a "restriction" on what is allowed to be used. WoW uses lua 5.0 and simply locks out certain functions from being usable...
As for a list of what can, and cannot be used, I don't know that anyone has that. Although my dreamweaver extension them all listed within the plugin, and highlights them. Perhaps when I get the code hints done I can release an open source list as well...
There are lists for the Global and Wiget API used by WOW, but I haven't seen a straight lua documentation made for WoW that excludes or at least mentions the unavailability of certain native functions.
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