[MLton] Two questions about FFI types

[Matthew Fluet]

> FYI, -default-ann doesn't accept 'allowPrim true', even if expert is 
> turned on. I had to make an mlb file. Is that a bug, or is there some 
> other magic to use secret annotations on the command line?

It isn't a bug, in as much as I specifically made a few annotations 
inaccessible from the commandline.  This could be changed, but I felt that 
as undocumented features, the barrier to using them could be higher, since 
they should only be used in the Basis Library implementation.

> 
>   - Tom
> 
> > To do this, you must compile the file that uses _prim with the
> > annotation "allowPrim true", using either the MLB "ann" syntax or
> > -default-ann from the command line.
> >
> >
> >
> 
> 
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