> x = Immutable.Map({a: 1, b: 2})
Map { "a": 1, "b": 2 }
> y = Immutable.Map({a: 1, b: 2})
Map { "a": 1, "b": 2 }

> x === y
false
> Immutable.is(x, y)
true
> x.equals(y)
true
> y.equals(x)
true

> x.merge(y)
Map { "a": 1, "b": 2 }
> x.merge(y) === x
true
> x.merge(y) === y
false
> y.merge(x) === y
true
> y.merge(x) === x
false