Smart matching was introduced in 5.10.0, and many problems were found after release. Don't be surprised if you run into some of them when using 5.10.0. 5.10.1 (and thus 5.12.x) fixes many problems with smart-matching.
$s ~~ @pats
can be written as
grep $s =~ $_, @pats
(Although I suspect the latter is a bit less efficient.)
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