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fix: disallow more characters in links - #5509
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As mentioned in #5486, this is the "second" part at making the link parser a bit better. This PR disallows characters from ASCII that aren't valid in domains. Similar to what GFM considers a valid domain, 0-9, A-Z, a-z, '-', '_', and '.' are allowed. However, since the parser should be able to parse "domains" that actually require punycode like https://köln.de, all characters outside ASCII are allowed. I think it's fine to allow these, even though it's a bit wrong.
Fixes #4769.