Small suggestion re: __siz

[Rici Lake <lua@...>]

My first reaction to __siz was "what happened to the e?" but on 
reflection, I think that __length would be less confusing. __siz[e] of 
a table would intuitively (to me, anyway) indicate the total size, not 
the length of the contiguous array component.

This could then be made consistent between strings and tables 
(table.len, string.len).

R.