docs: function min(comparer) {
  	    var min = (typeof comparer === 'function')
  	        ? function (x, y) { return comparer(x, y) < 0 ? x : y; }
  	        : function (x, y) { return x < y ? x : y; };
  	    return this.lift(new reduce_1.ReduceOperator(min));
  	}