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On Sep 13, 2009, at 11:55 PM, Juris Kalnins wrote:

On Sat, 12 Sep 2009 21:30:30 +0300, Mark Hamburg <> wrote:

Personally, on Lightroom, I wished for the ability to store nil in the userdata environment table.

That's harder. Currently it's a pointer to something that can be put in GC list, which excludes nil, bools, numbers and lightuserdata. Changing that would be a much bigger patch, and would increase size of userdata header.

Nil doesn't require an expansion of the data structures since a NULL pointer will do. It does require an expansion in the C code to deal with that case but possibly not much more than the expansion needed to handle types other than a table.