This bug was spotted by Tom Christiansen, but no bug report has been
written. /[[:ascii:]]/i should match the same set of code points as
/\p{ASCII}/i. But it is matching things outside the ASCII range
/sst/ui s\N{LATIN SMALL LIGATURE ST} y $& s\N{LATIN SMALL LIGATURE ST}
/sst/ui s\N{LATIN SMALL LIGATURE LONG S T} y $& s\N{LATIN SMALL LIGATURE LONG S T}
+# /i properties shouldn't match more than the property itself
+/[[:ascii:]]/i \N{KELVIN SIGN} Tn - -
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