fix(_bsontype): only check bsontype if it is a prototype member.

Author: daprahamian

Diff for: lib/bson/binary.js

@@ -40,8 +40,6 @@ function Binary(buffer, subType) {
     throw new Error('only String, Buffer, Uint8Array or Array accepted');
   }
 
-  this._bsontype = 'Binary';
-
   if (buffer instanceof Number) {
     this.sub_type = buffer;
     this.position = 0;
@@ -81,6 +79,11 @@ function Binary(buffer, subType) {
   }
 }
 
+Object.defineProperty(Binary.prototype, '_bsontype', {
+  value: 'Binary',
+  writable: false
+});
+
 /**
  * Updates this binary with byte_value.
  *

Diff for: lib/bson/code.js

@@ -8,11 +8,15 @@
  */
 var Code = function Code(code, scope) {
   if (!(this instanceof Code)) return new Code(code, scope);
-  this._bsontype = 'Code';
   this.code = code;
   this.scope = scope;
 };
 
+Object.defineProperty(Code.prototype, '_bsontype', {
+  value: 'Code',
+  writable: false
+});
+
 /**
  * @ignore
  */

Diff for: lib/bson/db_ref.js

@@ -10,12 +10,16 @@
 function DBRef(namespace, oid, db) {
   if (!(this instanceof DBRef)) return new DBRef(namespace, oid, db);
 
-  this._bsontype = 'DBRef';
   this.namespace = namespace;
   this.oid = oid;
   this.db = db;
 }
 
+Object.defineProperty(DBRef.prototype, '_bsontype', {
+  value: 'DBRef',
+  writable: false
+});
+
 /**
  * @ignore
  * @api private

Diff for: lib/bson/decimal128.js

@@ -181,10 +181,14 @@ var lessThan = function(left, right) {
  * @return {Double}
  */
 var Decimal128 = function(bytes) {
-  this._bsontype = 'Decimal128';
   this.bytes = bytes;
 };
 
+Object.defineProperty(Decimal128.prototype, '_bsontype', {
+  value: 'Decimal128',
+  writable: false
+});
+
 /**
  * Create a Decimal128 instance from a string representation
  *

Diff for: lib/bson/double.js

@@ -8,10 +8,14 @@
 function Double(value) {
   if (!(this instanceof Double)) return new Double(value);
 
-  this._bsontype = 'Double';
   this.value = value;
 }
 
+Object.defineProperty(Double.prototype, '_bsontype', {
+  value: 'Double',
+  writable: false
+});
+
 /**
  * Access the number value.
  *

Diff for: lib/bson/int_32.js

@@ -8,10 +8,14 @@
 var Int32 = function(value) {
   if (!(this instanceof Int32)) return new Int32(value);
 
-  this._bsontype = 'Int32';
   this.value = value;
 };
 
+Object.defineProperty(Int32.prototype, '_bsontype', {
+  value: 'Int32',
+  writable: false
+});
+
 /**
  * Access the number value.
  *

Diff for: lib/bson/long.js

@@ -43,7 +43,6 @@
 function Long(low, high) {
   if (!(this instanceof Long)) return new Long(low, high);
 
-  this._bsontype = 'Long';
   /**
    * @type {number}
    * @ignore
@@ -57,6 +56,11 @@ function Long(low, high) {
   this.high_ = high | 0; // force into 32 signed bits.
 }
 
+Object.defineProperty(Long.prototype, '_bsontype', {
+  value: 'Long',
+  writable: false
+});
+
 /**
  * Return the int value.
  *

Diff for: lib/bson/max_key.js

@@ -6,9 +6,12 @@
  */
 function MaxKey() {
   if (!(this instanceof MaxKey)) return new MaxKey();
-
-  this._bsontype = 'MaxKey';
 }
 
+Object.defineProperty(MaxKey.prototype, '_bsontype', {
+  value: 'MaxKey',
+  writable: false
+});
+
 module.exports = MaxKey;
 module.exports.MaxKey = MaxKey;

Diff for: lib/bson/min_key.js

@@ -6,9 +6,12 @@
  */
 function MinKey() {
   if (!(this instanceof MinKey)) return new MinKey();
-
-  this._bsontype = 'MinKey';
 }
 
+Object.defineProperty(MinKey.prototype, '_bsontype', {
+  value: 'MinKey',
+  writable: false
+});
+
 module.exports = MinKey;
 module.exports.MinKey = MinKey;

Diff for: lib/bson/objectid.js

@@ -39,8 +39,6 @@ var ObjectID = function ObjectID(id) {
   if (id instanceof ObjectID) return id;
   if (!(this instanceof ObjectID)) return new ObjectID(id);
 
-  this._bsontype = 'ObjectID';
-
   // The most common usecase (blank id, new objectId instance)
   if (id == null || typeof id === 'number') {
     // Generate a new id
@@ -78,6 +76,11 @@ var ObjectID = function ObjectID(id) {
   if (ObjectID.cacheHexString) this.__id = this.toString('hex');
 };
 
+Object.defineProperty(ObjectID.prototype, '_bsontype', {
+  value: 'ObjectID',
+  writable: false
+});
+
 // Allow usage of ObjectId as well as ObjectID
 // var ObjectId = ObjectID;
 

Diff for: lib/bson/parser/calculate_size.js

@@ -61,6 +61,7 @@ function calculateElement(name, value, serializeFunctions, isArray, ignoreUndefi
   if (value && value.toBSON) {
     value = value.toBSON();
   }
+  var _bsontype, _objPrototype;
 
   switch (typeof value) {
     case 'string':
@@ -84,15 +85,17 @@ function calculateElement(name, value, serializeFunctions, isArray, ignoreUndefi
     case 'boolean':
       return (name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) + (1 + 1);
     case 'object':
+      var _objPrototype = value && Object.getPrototypeOf(value)
+      var _bsontype = _objPrototype && _objPrototype._bsontype || undefined;
       if (
         value == null ||
         value instanceof MinKey ||
         value instanceof MaxKey ||
-        value['_bsontype'] === 'MinKey' ||
-        value['_bsontype'] === 'MaxKey'
+        _bsontype === 'MinKey' ||
+        _bsontype === 'MaxKey'
       ) {
         return (name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) + 1;
-      } else if (value instanceof ObjectID || value['_bsontype'] === 'ObjectID' || value['_bsontype'] === 'ObjectId') {
+      } else if (value instanceof ObjectID || _bsontype === 'ObjectID' || _bsontype === 'ObjectId') {
         return (name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) + (12 + 1);
       } else if (value instanceof Date || isDate(value)) {
         return (name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) + (8 + 1);
@@ -104,14 +107,14 @@ function calculateElement(name, value, serializeFunctions, isArray, ignoreUndefi
         value instanceof Long ||
         value instanceof Double ||
         value instanceof Timestamp ||
-        value['_bsontype'] === 'Long' ||
-        value['_bsontype'] === 'Double' ||
-        value['_bsontype'] === 'Timestamp'
+        _bsontype === 'Long' ||
+        _bsontype === 'Double' ||
+        _bsontype === 'Timestamp'
       ) {
         return (name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) + (8 + 1);
-      } else if (value instanceof Decimal128 || value['_bsontype'] === 'Decimal128') {
+      } else if (value instanceof Decimal128 || _bsontype === 'Decimal128') {
         return (name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) + (16 + 1);
-      } else if (value instanceof Code || value['_bsontype'] === 'Code') {
+      } else if (value instanceof Code || _bsontype === 'Code') {
         // Calculate size depending on the availability of a scope
         if (value.scope != null && Object.keys(value.scope).length > 0) {
           return (
@@ -132,7 +135,7 @@ function calculateElement(name, value, serializeFunctions, isArray, ignoreUndefi
             1
           );
         }
-      } else if (value instanceof Binary || value['_bsontype'] === 'Binary') {
+      } else if (value instanceof Binary || _bsontype === 'Binary') {
         // Check what kind of subtype we have
         if (value.sub_type === Binary.SUBTYPE_BYTE_ARRAY) {
           return (
@@ -144,15 +147,15 @@ function calculateElement(name, value, serializeFunctions, isArray, ignoreUndefi
             (name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) + (value.position + 1 + 4 + 1)
           );
         }
-      } else if (value instanceof Symbol || value['_bsontype'] === 'Symbol') {
+      } else if (value instanceof Symbol || _bsontype === 'Symbol') {
         return (
           (name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) +
           Buffer.byteLength(value.value, 'utf8') +
           4 +
           1 +
           1
         );
-      } else if (value instanceof DBRef || value['_bsontype'] === 'DBRef') {
+      } else if (value instanceof DBRef || _bsontype === 'DBRef') {
         // Set up correct object for serialization
         var ordered_values = {
           $ref: value.namespace,
@@ -183,7 +186,7 @@ function calculateElement(name, value, serializeFunctions, isArray, ignoreUndefi
           (value.multiline ? 1 : 0) +
           1
         );
-      } else if (value instanceof BSONRegExp || value['_bsontype'] === 'BSONRegExp') {
+      } else if (value instanceof BSONRegExp || _bsontype === 'BSONRegExp') {
         return (
           (name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) +
           1 +