Using luabind wrapped types as keys into lua tables

Any type can be used as a key in a lua table, so I'd like to use
references to luabind wrapped types. The problem is that different lua
variables pointing to the same luabind C++ data are going to be seen
as different keys from the point of view of a lua table. For example:

mypin = c.pins:at(0)
mypin2 = c.pins:at(0)

pinmap = {}
pinmap[mypin] = "hello"
print(pinmap[mypin2]) -- Results in (null) printed.

-- But:

mypin = c.pins:at(0)
mypin2 = mypin
pinmap[mypin] = "hello"
pinr(pinmap[mypin2]) -- Results in "hello" printed, no problem

mypin and mypin2 can't be used as the same key from the point of view
of a lua table.

Is there a way to get to the raw data pointer, so that can be used as a key
instead?

Regards,
Greg Santucci

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