to be within: Don't put numeric ranges in quotes.

lib/assertions.js

@@ -283,7 +283,7 @@ module.exports = function (expect) {
     });
 
     expect.addAssertion(['number', 'string'], '[not] to be within', function (expect, subject, start, finish) {
-        this.args = [expect.output.clone().number(start).text('..').number(finish)];
+        this.args = [expect.output.clone().append(expect.inspect(start)).text('..').append(expect.inspect(finish))];
         expect(subject >= start && subject <= finish, '[not] to be truthy');
     });
 

test/unexpected.spec.js

@@ -1232,13 +1232,19 @@ describe('unexpected', function () {
         it('throws when the assertion fails', function () {
             expect(function () {
                 expect(4, 'not to be within', 0, 4);
-            }, 'to throw exception', "expected 4 not to be within 0..4");
+            }, 'to throw exception', 'expected 4 not to be within 0..4');
             expect(function () {
                 expect(null, 'not to be within', 0, 4);
             }, 'to throw exception',
                    'The assertion "not to be within" is not defined for the type "null",\n' +
                    'but it is defined for these types: "number", "string"');
         });
+
+        it('throws with the correct error message when the end points are strings', function () {
+            expect(function () {
+                expect('a', 'to be within', 'c', 'd');
+            }, 'to throw exception', "expected 'a' to be within 'c'..'d'");
+        });
     });
 
     describe('less than assertion', function () {