It's possible to alias hash values. 
$ perl -MData::Alias -E'
   @_ = ( a=>4 );
   alias %_ = @_;
   $_[1]=5; say $_{a};
   $_{a}=6; say $_[1];
'
5
6

[download]

However, copying args is a good thing. That's why we don't access @_ directly.

In reply to Re^4: Why doesn't Perl provide %_ as the hash equivalent of @_ in subs? by ikegami
in thread Why doesn't Perl provide %_ as the hash equivalent of @_ in subs? by smls

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