Custom matchers fail to behave as expected

If they return false, that should be respected.

Submitted via @tjgrathwell

[Finish #58184156]
close #434

lib/jasmine-core/jasmine.js

@@ -1781,9 +1781,9 @@ getJasmineRequireObj().matchersUtil = function(j$) {
     var result = true;
 
     for (var i = 0; i < customTesters.length; i++) {
-      result = customTesters[i](a, b);
-      if (result) {
-        return true;
+      var customTesterResult = customTesters[i](a, b);
+      if (!j$.util.isUndefined(customTesterResult)) {
+        return customTesterResult;
       }
     }
 

spec/core/matchers/matchersUtilSpec.js

@@ -153,10 +153,22 @@ describe("matchersUtil", function() {
       expect(j$.matchersUtil.equals(1, 2, [tester])).toBe(true);
     });
 
+    it("passes for two empty Objects", function () {
+      expect(j$.matchersUtil.equals({}, {})).toBe(true);
+    });
+
+    describe("when a custom equality matcher is installed that returns 'undefined'", function () {
+      var tester = function(a, b) { return jasmine.undefined; };
+
+      it("passes for two empty Objects", function () {
+        expect(j$.matchersUtil.equals({}, {}, [tester])).toBe(true);
+      });
+    });
+
     it("fails for equivalents when a custom equality matcher returns false", function() {
       var tester = function(a, b) { return false; };
 
-      expect(j$.matchersUtil.equals(1, 2, [tester])).toBe(false);
+      expect(j$.matchersUtil.equals(1, 1, [tester])).toBe(false);
     });
   });
 

src/core/matchers/matchersUtil.js

@@ -52,9 +52,9 @@ getJasmineRequireObj().matchersUtil = function(j$) {
     var result = true;
 
     for (var i = 0; i < customTesters.length; i++) {
-      result = customTesters[i](a, b);
-      if (result) {
-        return true;
+      var customTesterResult = customTesters[i](a, b);
+      if (!j$.util.isUndefined(customTesterResult)) {
+        return customTesterResult;
       }
     }
 
@@ -176,4 +176,4 @@ getJasmineRequireObj().matchersUtil = function(j$) {
       return typeof obj === 'function';
     }
   }
-};
+};