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Re: Unicode surrogates
To put it another way, Windows allows characters that are not part
of Unicode to be used to name files. If we restrict our character
set for filenames to Unicode-only, we will not be able to open
those files. That problem is real.
That does not mean it's a problem we need to solve.
If you make it use to create filenames containing unpaired surrogates,
that just means you make it easy to files with garbage filenames.
I don't see that as a feature. Any such filenames are presumably
unintentional and due to bugs. We don't need a standard Scheme API
for dealing with those bugs, just like we don't need a standard Scheme
API for editing the registry.