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A small feature request to distract you all from the noise on the list recently:

I often find myself writing code like
mt.__newindex = function ( t , k , v )
    v = dosomethingwithv ( v )

Could we make it so the return value of __newindex is then set as the
value in t?

It will be backwards compatible, as the majority of code out there
don't return anything from __newindex operations.

 - One less line of code
 - __newindex operations can now do a tail call; `function (t,k,v)
return dosomethingwithv(v) end;
 -  I assume it can be optimised quite well in the actual
implementation, as the key has already been hashed; and we know its
not already in the table.