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string port encodings

From: Andy Wingo
Subject: string port encodings
Date: Tue, 15 Jan 2013 15:36:11 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.2 (gnu/linux)

Quiz: what does this do?

  (define (f s)
    (with-output-to-string (lambda () (display s))))

When called with a string, what should it do?  Like (f "foo").

If you answered, "return the string", that's what I would think it
should do.

But no, currently the answer is locale-specific.  It encodes the string
according to the current locale, then decodes it from that encoding.  If
your locale can't encode the string, tough luck for you!

This is a bit crazy.  Surely the port should be textual?  Surely the
default encoding for a string port should be utf-8 or something that can
actually handle all strings?


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