code: function _curry3 (fn, isRightCurry) {
      return function (a) {
          return function (b) {
              return function (c) {
                  return isRightCurry ? fn.call(this, c, b, a) : fn.call(this, a, b, c);
              };
          };
      };
  }
docs: Curries a function of arity 3.
  @private
  @param {Function} fn
  @param {Boolean} [isRightCurry=false]
  @returns {Function}