> ./create-nested-hash.pl foo/bar/baz=10 spam/eggs/ham=hi foo/stuff=20 top='Tophat!'
{
  "spam" => {
    "eggs" => {
      "ham" => "hi"
    }
  },
  "top" => "Tophat!",
  "foo" => {
    "bar" => {
      "baz" => 10
    },
    "stuff" => 20
  }
}