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Zash
Where might it be defined that ASCII control characters can't be sent in XMPP/XML streams?
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Zash
Ah, here we go, https://tools.ietf.org/html/rfc3470#section-4.11
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flow
Zash, I think this is defined by XMPP using XML 1.0, and IIRC XML 1.0 forbids control characters (whereas XML 1.1 does not IIRC)