Standard metatable

[Sebastian Rohde <rohde@...>]

Hi everybody!

While working on our lua_State serialization I found that lua tables seem to
have a metatable even if it seems that none has been set by the user or by
our code. Is that correct? 
Can this metatable be safely ignored and how can I distinguish this
metatable from user defined to ignore it during serialization? (And why did
this metatable not have this standard metatable?)

Thanks!

Yours,
Sebastian