The code works differently than the docs, and the code is right here. Fix the doc hence. See VALID_CHARS in unit-name.c for details about allowed chars in unit names, but keep in mind that "-" and "\" are special, since generated by the escaping logic: they are OK to show up in unit names, but need to be escaped when converting foreign strings to unit names to make sure things remain reversible. Fixes: #19623
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