Glitch in __len metamethod for full userdata?

[Michael Roth <mroth@...>]

Hello,

I came across a small documentation or maybe implementation glitch:

The documentation at http://www.lua.org/manual/5.1/manual.html#2.8 states, 
that the #-operator will eventually call the __len metamethod with

    h(op)

But at least for userdata with a metatable and a __len metamethod, the call in 
reality is:

    h(op, nil)

I came across this issue because I employed an assert(lua_top(L)==1) in my 
code... Not a big issue... But maybe someone interested in?


Michael Roth