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-rw-r--r--src/new_fields/Doc.ts2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/new_fields/Doc.ts b/src/new_fields/Doc.ts
index b0237d04d..793a83750 100644
--- a/src/new_fields/Doc.ts
+++ b/src/new_fields/Doc.ts
@@ -194,7 +194,7 @@ export namespace Doc {
// gets the document's prototype or returns the document if it is a prototype
export function GetProto(doc: Doc) {
- return Object.getOwnPropertyNames(doc).indexOf("isPrototype") === -1 ? doc.proto! : doc;
+ return Doc.GetT(doc, "isPrototype", "boolean", true) ? doc : doc.proto!;
}