hand wrapping cluttermm functions (again)

[Ian Martin <martin_id vodafone co nz>]

Hi,
I'm (still) wrapping some of cluttermm- or at least trying to (thanks 
Murray and Kjell- your replies helped++).
The Clutter::Animator::set_key() function has no conversion between 
values; if passed (e.g.) a double, it will compile and run but std::cout 
gets a stream of messages about not having a float.  My understanding of 
the problem is that there is the possibility of defining a custom 
property to animate, so type-checking can't happen.
The value is stored in a GParamSpec.  It might be possible to create an 
empty GParamSpec with the correct name, query it for the appropriate 
value type, and convert the passed in value to the correct type.  Is 
there anywhere in the g*mm source that does something like this?
And should I be trying to do this in the wrapper or filing a bug against 
the Clutter code?
Ian