params to __tostring

[spir <denis.spir@...>]

Hello,

Is there a way to pass additional params to the function pointed by __tostring? 
(Would be practicle for instance to pass the set of already seen tables in 
stringing functions specialised for arrays, maps, objects, trees...)
However, when I try s=tostring(x, p), the target of __tostring does not seem to 
receive p.

Denis