1 files changed, 13 insertions, 8 deletions

diff --git a/src/new_fields/Doc.ts b/src/new_fields/Doc.ts
index f4514c33e..b0237d04d 100644
--- a/src/new_fields/Doc.ts
+++ b/src/new_fields/Doc.ts
@@ -19,12 +19,15 @@ export namespace Field {
             return field[ToScriptString]();
         }
     }
-    export function IsField(field: any): field is Field {
+    export function IsField(field: any): field is Field;
+    export function IsField(field: any, includeUndefined: true): field is Field | undefined;
+    export function IsField(field: any, includeUndefined: boolean = false): field is Field | undefined {
         return (typeof field === "string")
             || (typeof field === "number")
             || (typeof field === "boolean")
             || (field instanceof ObjectField)
-            || (field instanceof RefField);
+            || (field instanceof RefField)
+            || (includeUndefined && field === undefined);
     }
 }
 export type Field = number | string | boolean | ObjectField | RefField;
@@ -116,7 +119,6 @@ export class Doc extends RefField {
     }
 
     public [HandleUpdate](diff: any) {
-        console.log(diff);
         const set = diff.$set;
         if (set) {
             for (const key in set) {
@@ -149,6 +151,9 @@ export namespace Doc {
     export function GetT<T extends Field>(doc: Doc, key: string, ctor: ToConstructor<T>, ignoreProto: boolean = false): FieldResult<T> {
         return Cast(Get(doc, key, ignoreProto), ctor) as FieldResult<T>;
     }
+    export function IsPrototype(doc: Doc) {
+        return GetT(doc, "isPrototype", "boolean", true);
+    }
     export async function SetOnPrototype(doc: Doc, key: string, value: Field) {
         const proto = Object.getOwnPropertyNames(doc).indexOf("isPrototype") === -1 ? doc.proto : doc;
 
@@ -180,11 +185,11 @@ export namespace Doc {
 
     // compare whether documents or their protos match
     export function AreProtosEqual(doc: Doc, other: Doc) {
-        let r = (doc[Id] === other[Id]);
-        let r2 = (doc.proto && doc.proto.Id === other[Id]);
-        let r3 = (other.proto && other.proto.Id === doc[Id]);
-        let r4 = (doc.proto && other.proto && doc.proto[Id] === other.proto[Id]);
-        return r || r2 || r3 || r4 ? true : false;
+        let r = (doc === other);
+        let r2 = (doc.proto === other);
+        let r3 = (other.proto === doc);
+        let r4 = (doc.proto === other.proto);
+        return r || r2 || r3 || r4;
     }
 
     // gets the document's prototype or returns the document if it is a prototype