[m-rev.] for review: C foreign types

[Peter Ross]

fjh wrote:
> >
> > I have changed it to sizeof(CForeignType) == sizeof(char *).
> 
> Use `void *' rather than `char *' as the generic pointer type.
> 
> This restriction alone is not sufficient, e.g. it still won't work
> correctly for floating point types or structs that happen to have the
> right size.
> 
Why not?

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