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Re: mirage + ocaml4

I've merged Thomas' cstruct branch and pushed to my working copy at 
Encouragingly, porting ocaml-xenstore only took a 4 line diff so this should go 
pretty fast.

One performance crime that I noticed is the Cstruct.blit_string function, which 
does a byte-by-byte copy from a string to a Bigarray.  Pierre, do you have any 
thoughts on how to improve this?  A faster blit between them would be quite 

Also Mort, can you remind me why on earth there's a type 'ipv4' and 'ipv6' in 
cstruct? This seems very out of place in this library, but was it there for 
some dependency reason or just because it's convenient (which is also a fine 




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