Better ES3 support:

 - `delete` is a ES3 reserved word and must be quoted.
 - `int` is a reserved word

test/collections.js

@@ -206,7 +206,7 @@ describe('Collections', function () {
 
     it('should return false when deleting a nonexistent key', function () {
       expect(map.has('a')).to.equal(false);
-      expect(map.delete('a')).to.equal(false);
+      expect(map['delete']('a')).to.equal(false);
     });
 
     it('should have keys, values and size props', function () {
@@ -477,7 +477,7 @@ describe('Collections', function () {
 
     it('should return false when deleting an item not in the set', function () {
       expect(set.has('a')).to.equal(false);
-      expect(set.delete('a')).to.equal(false);
+      expect(set['delete']('a')).to.equal(false);
     });
 
     it('should accept an iterable as argument', function () {

test/number.js

@@ -136,9 +136,9 @@ describe('Number', function (undefined) {
 
     it('should be true when abs(number) is less than 2^53', function () {
       var safeIntegers = [0, 1, Math.pow(2, 53) - 1];
-      safeIntegers.forEach(function (int) {
-        expect(Number.isInteger(int)).to.equal(true);
-        expect(Number.isInteger(-int)).to.equal(true);
+      safeIntegers.forEach(function (integer) {
+        expect(Number.isInteger(integer)).to.equal(true);
+        expect(Number.isInteger(-integer)).to.equal(true);
       });
     });
   });
@@ -180,9 +180,9 @@ describe('Number', function (undefined) {
 
     it('should be true when abs(number) is less than 2^53', function () {
       var safeIntegers = [0, 1, Math.pow(2, 53) - 1];
-      safeIntegers.forEach(function (int) {
-        expect(Number.isSafeInteger(int)).to.equal(true);
-        expect(Number.isSafeInteger(-int)).to.equal(true);
+      safeIntegers.forEach(function (integer) {
+        expect(Number.isSafeInteger(integer)).to.equal(true);
+        expect(Number.isSafeInteger(-integer)).to.equal(true);
       });
     });
   });