It seems to be partially working, though

(I'm reading that that you would like it to match in the list case (1, 17, 4) ~~ 17, too.)

I think it doesn't treat arrays and lists the same way (from "Smart matching in detail" in perlsyn):

$a      $b        Type of Match Implied    Matching Code
======  =====     =====================    =============
...
Array   Num       array contains number    grep $_ == $b, @$a
...
[download]

If you have a list instead of an array, it interprets it in scalar context, i.e. it just uses the last element, here 4:

say "second match succeeds" if ((1, 17, 4) ~~ 4);
[download]

I personally find this somewhat counterintuitive, too, but I suspect the language designers have had their reason to make it behave that way...

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