code: function extend(a, b) {
      var rec = function(a, b) {
          var i;
          for(i in b) {
              a[i] = b[i];
          }
          return a;
      };
      return rec(rec({}, a), b);
  }
docs: ## extend(a, b)  Right-biased key-value concat of objects `a` and `b`:  squishy.extend({a: 1, b: 2}, {b: true, c: false}) == {a: 1, b: true, c: false}