Add strict equalities in src/core/obj.js

src/core/obj.js

@@ -98,12 +98,12 @@ var Dict = (function DictClosure() {
     get: function Dict_get(key1, key2, key3) {
       var value;
       var xref = this.xref;
-      if (typeof (value = this.map[key1]) != 'undefined' || key1 in this.map ||
+      if (typeof (value = this.map[key1]) !== 'undefined' || key1 in this.map ||
-          typeof key2 == 'undefined') {
+          typeof key2 === 'undefined') {
         return xref ? xref.fetchIfRef(value) : value;
       }
-      if (typeof (value = this.map[key2]) != 'undefined' || key2 in this.map ||
+      if (typeof (value = this.map[key2]) !== 'undefined' || key2 in this.map ||
-          typeof key3 == 'undefined') {
+          typeof key3 === 'undefined') {
         return xref ? xref.fetchIfRef(value) : value;
       }
       value = this.map[key3] || null;
@@ -652,7 +652,7 @@ var Catalog = (function CatalogClosure() {
           for (var i = 0; i < kids.length; i++) {
             var kid = kids[i];
             assert(isRef(kid), 'kids must be a ref');
-            if (kid.num == kidRef.num) {
+            if (kid.num === kidRef.num) {
               found = true;
               break;
             }
@@ -976,7 +976,7 @@ var XRef = (function XRefClosure() {
         // finding byte sequence
         while (offset < dataLength) {
           var i = 0;
-          while (i < length && data[offset + i] == what[i]) {
+          while (i < length && data[offset + i] === what[i]) {
             ++i;
           }
           if (i >= length) {