Creating new operators

• New operators can be defined just like any other sub
• multi sub infix:<+>(MyInt $a, MyInt $b) overloads addition for MyInt
• sub postfix:<!>(Int $a) { [*] 1..$a; } creates a factorial operator:
• 5! yields 120, just as you would expect
• sub prefix:<$$$>($a) { "$a billion dollars" }
• $$$10 yields the string 10 billion dollars
• In theory, these new operators can be used with meta operators too
• Though that may be still a bit buggy in Rakudo

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