[Bug] Wording

["Soni L." <fakedme@...>]

The manual says "The type table implements associative arrays, that is, 
arrays that can be indexed not only with numbers, but with any Lua value 
except nil and NaN."

I believe this would be better worded as "The type table implements 
associative arrays, that is, arrays that can have as indices not only 
numbers, but any Lua value except nil and NaN."

The truth is, v=t[nil] and t[nil]=v both are valid Lua code, except the 
latter errors because *a nil index cannot exist*. More specifically, you 
cannot *create* a nil index, but you can check for its existence. Same 
for NaN.

This wording more accurately represents the reference implementation, 
and I believe this is intended behaviour.

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