"Should get" versus "do get" is an important distinction. Have a look inside constant and see: 
 {
        no strict 'refs';
        my $full_name = "${pkg}::$name";
        $declared{$full_name}++;
        if (@_ == 1) {
            my $scalar = $_[0];
            *$full_name = sub () { $scalar };
        } elsif (@_) {
            my @list = @_;
            *$full_name = sub () { @list };
        } else {
            *$full_name = sub () { };
        }
    }

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Looks like a regular subroutine for me. No inline. Maybe in Perl 6.

In reply to Re^3: %hash (@array && use constant) in Modules by tadman
in thread %hash (@array && use constant) in Modules by abaxaba

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