That's right: it should be $$self[MAGIC_VALS]{$magic_val} instead!
I'd say it should've been
$self->[MAGIC_VALS]{$magic_val}... But yeah, as LanX said,
@$ is part of the
$ typeglob.
@$ and its friend
%$ are not 'magic', but they are a part of a larger structure, one element of which (
$$) is 'magic', and so the entire glob is special-cased to supress
strict... something like that.
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