code: function createCombi (types, options) {
      var tests = types.map(function (type) {
        return ducktype(type).test;
      });
  
      return new DuckType({
        name: options && options.name || null,
        test: function test (object) {
          for (var i = 0, ii = tests.length; i < ii; i++) {
            if (tests[i](object)) {
              return true;
            }
          }
          return false;
        }
      });
    }
docs: Create a ducktype handling a combination of types
  @param {Array} types
  @param {{name: String}} [options]
  @returns {*}