This is what prototypes are properly used for.

$ perl -e'print prototype( "CORE::splice"),$/'
\@;$;$@
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The \@ prototype requires a variable with the @ sigil and implicitly converts it to a reference. If you define sub mysplice (\@;$;$@) { ...}, you will obtain splice-like behavior with respect to the arguments.

After Compline,
Zaxo