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> That would confuse "C" people.

Lua never gave a dime to how it compares to C or to make similar or
non-confusing dissimilarities.

Otherwise # to be a shorthand for length for the innermost array would
be a welcome shortening, and in some cases even more efficient.

a.b.c.d.e[#] = 1
a.b.c.d.e[a.b.c.d.e.length] = 1

Where the former only walks to look up chain through once, to gain
same performance with current lua, you need a temporary variable.