Also funny story: in Perl “,” can be spelled “=>” specifically for this sort of use cases, when you write

    my %hash = (
        Foo => “bar”,
        Baz => “qux”,
    );

the behaviour is no different than

    my %hash = (
        Foo, “bar”,
        Baz, “qux”,
    );

it’s just that a literal plist in a hash context is interpreted as a hash.

Hence “=>” being called “fat comma” in perl.

Which means you can writer

    my %h = (a => b => c => d);

or

    my %h = (a, b => c, d);

they all mean the same thing.