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I would re-write that section as follows:

Unless the __len metamethod is set, the length N is defined for a
table which contains consecutive, positive integer keys from 1 to N
and does not contain any positive integer keys outside the range 1 to
N.  Such a table is said to contain a 'proper sequence'.

The following types of keys do not affect the length of the table and
whether or not it contains a proper sequence:

0 (zero)
negative integer (-1, -2, -55, etc.)
non-integer (-1.3, 3.14159265, etc.)
other non-numeric (strings, tables, functions, etc.)

James Graves