[plt-scheme] Accessing struct types from C

Hi

In my quest for non-variant COM arrays I want to use f32vectors to  
create single-float arrays.
My question is: how can I know I have an f32vector in hands? I was  
thinking I could access the name of the structure type, but I don't  
know if I can use the types defined in schpriv.h (Scheme_Struct_Type- 
 >name->s, assuming it's a symbol) or are they only for private use  
and I should use another API? The Inside MzScheme document isn't  
hellping a lot when dealing with structures. I'll also take a look at  
a (normal) Scheme vector with single floats (from foreign) and see how  
I can identify them.


Thanks for the help

   - Filipe Cabecinhas