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Is there any chance that the table entry used to store the number of elements,
ie. n, can be renamed to something less likely to cause a name clash with user

eg. _n or __n__

getn (table)
Returns the ``size'' of a table, when seen as a list. If the table has an n
field with a numeric value, this value is the ``size'' of the table. Otherwise,
the ``size'' is the largest numerical index with a non-nil value in the table.
This function could be defined in Lua:
       function getn (t)
         if type(t.n) == "number" then return t.n end
         local max = 0
         for i, _ in t do
           if type(i) == "number" and i>max then max=i end
         return max


Criminal: A person with predatory instincts who has not sufficient capital to
form a corporation.
 - Howard Scott