From @MasterDuke17

<MasterDuke> m​: say :3<12>
<camelia> rakudo-moar 466770​: OUTPUT«5␤»
<MasterDuke> m​: say :۳<12>
<camelia> rakudo-moar 466770​: OUTPUT«===SORRY!===␤Error encoding ASCII string​: could not encode codepoint 1779␤»

<MasterDuke> m​: "a b" ~~ /(\w) \s (\w)/; say $1
<camelia> rakudo-moar 466770​: OUTPUT«｢b｣␤»
<MasterDuke> m​: "a b" ~~ /(\w) \s (\w)/; say $١
<camelia> rakudo-moar 466770​: OUTPUT«===SORRY!===␤Error encoding ASCII string​: could not encode codepoint 1633␤»

<MasterDuke> m​: sub f(-1) { say "hi" }; say f(-1)
<camelia> rakudo-moar 466770​: OUTPUT«hi␤True␤»
<MasterDuke> m​: sub f(-١) { say "hi" }; say f(-1)
<camelia> rakudo-moar 466770​: OUTPUT«===SORRY!===␤Error encoding ASCII string​: could not encode codepoint 1633␤»

From @MasterDuke17

Fixed in rakudo/rakudo#878

Tests in Raku/roast@968764ed4d

@MasterDuke17 - Status changed from 'new' to 'resolved'