Excluding all of "legacy controls" not just as literals but also escaped strings (e.g. "\u0027") seems too much. C1 is essentially unused AFAIK and that's okay, but a number of C0 characters do see real-world use (escape, EOF, NUL). IMHO there are valid and reasonable use cases to use some of them.

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NelsonMinar 4 days ago | parent | next [-]

I've made good use of unusual C0 characters like U+001E (Record Separator). I think it makes sense to exclude them from documents but they can be useful in text data streams.

	▲	senderista 3 days ago \| parent [-]
		Agreed, I would be very annoyed to see separator characters arbitrarily rejected by software I don't control. I think these characters are seriously underused, considering all the issues with in-band separators.

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msgodel 3 days ago | parent | prev [-]

I've seen program source code with form feeds (U+000C) in it. Apparently Emacs has built in support for using them for navigation so adjacent things occasionally contain them.