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> __len is still able to return non number values. What is the position 
> about that? Is that the desired behaviour?

__len can return any Lua value:

for k,v in ipairs({true,print,"hello",{},io.stdin}) do
	a=setmetatable({},{__len=function() return v end})

1	true	true
2	function: 0x9bbdfd0	function: 0x9bbdfd0
3	hello	hello
4	table: 0x9bc2240	table: 0x9bc2240
5	file (0x2e5420)	file (0x2e5420)