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I'm pretty sure this has to do with tables remembering "old" keys.
This is important for next() when you try to check the next key/value
pair 'after' removing the last...


for k in pairs(t) do t[k] = nil end

Note that if you try to call next() with an invalid key (one that was
never in the table), you get an error raised.

While assigning a new table does "fix" it, there probably should be
some sort of collection of these unused keys.

Note: I'm sure some of what I said is technically misleading (due to
my misunderstanding), but I hope the general idea is understood.

-Patrick Donnelly

"One of the lessons of history is that nothing is often a good thing
to do and always a clever thing to say."

-Will Durant