[plt-scheme] Doc pointer? for foreign library memory management

I'm creating bindings for foreign libraries that allocate memory,  
presumably with malloc, and I'm trying to figure out what I need to do  
in order to make it cooperate with 3m.  Is there any documentation on  
this?  It looks like the FFI docs refer to Inside PLT Scheme, and  
those docs suggest that these newly created pointers should be  
registered with the collector.  However, looking at sndfile.ss and the  
documentation for register-finalizer, I get the sense that I don't  
need to register these pointers, that the scheme/foreign library is  
taking care of this for me.

Again, if there's existing documentation that covers this, I'm all ears.

Many thanks,

John

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