I see, it is reasoned. If we strictly follow the logic,
the length operator should ideally return nil in theese cases,
because "it usually represents the absence of a useful value".
This has been debated here many many times. The trouble is that any algorithm that can detect that a table is NOT a sequence is significantly more expensive that the current # algorithm. The Lua teams position is that in the majority of cases you would know if a table was a sequence or not and hence the extra checking would be a (significant) waste of time.
—Tim
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