unsafe bytes->immutable

Hello,
Is it possible to make immutable bytes without incurring the copy? 
It is useful
for read-only bytes that can be used with open-input-port, which 
makes a copy
unless it is immutable. Particular use-case : parsing part of a 
buffer,
extracting the rest with subbytes and then using with 
open-input-port, makes 2 copies of the buffer.

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