That is another point where I strongly disagree with 'Perl Best Practices'. Passing a hash reference as an argument to a sub is just that -: it is passing one argument to a subroutine which expects one argument - a hash reference, and not a list of parameters (named or not).

In my book of 'Personal Best Practices' curlies are for hash references or for code blocks. Constructing and destroying a hash to pass named params is just silly. See also my answer to AnomalousMonk.