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What I find interesting is that an explicitly set nil value is not considered a "hole" in the table.

According to the documentation that shouldn't be.  A bug?

By the way, I find the documentation wording very confusing:

The length of a table t is defined to be any integer index n such that t[n] is not nil and t[n+1] is nil; moreover, if t[1] is nil, n ***may*** be zero. For a regular array, with non-nil values from 1 to a given n, its length is exactly that n, the index of its last value. If the array has "holes" (that is, nil values between other non-nil values), then #t ***may*** be any of the indices that directly precedes a nil value (that is, it ***may*** consider any such nil value as the end of the array).

It _might_ consider a nil the end?  Well, does it or does it not?  And if it can change I think that needs to be made clear.

// Chris