I'd do it this way. 

sub xyz {
    croak 'Bad args' unless @_ == 2 or @_ == 3;
    my( $yyy, $xxx, $ttt ) = reverse @_;
    ...
}

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In the absence of evidence, opinion is indistinguishable from prejudice.
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In reply to Re: Format / Logical Expression / Style Opinions: my, ternary, subroutine, @_ by BrowserUk
in thread Format / Logical Expression / Style Opinions: my, ternary, subroutine, @_ by jffry

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