Horray, z is now official! There are a LOT of improvements and changes

now z match strings:

'test'.matches(
    (x = 'testa') => false,
    (x = 'test') => true,
    (x = 'testo') => false,
    function otherwise () { return false }
).should.equal(true)

• Pattern matching
• Pattern matching with value comparison (ES6 w/ default parameters only)
• Helper methods: head, init, last, tail