From f1900723768dcfef0ecfa8b8d323cc21df8179aa Mon Sep 17 00:00:00 2001
From: Matt Broadstone <mbroadst@mongodb.com>
Date: Fri, 12 Jul 2019 12:34:54 -0400
Subject: [PATCH] fix(change-streams): don't copy irrelevant resume options

---
 lib/change_stream.js | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/lib/change_stream.js b/lib/change_stream.js
index c9162db3b3..59bbc882e9 100644
--- a/lib/change_stream.js
+++ b/lib/change_stream.js
@@ -272,10 +272,14 @@ class ChangeStreamCursor extends Cursor {
       if (this.options[optionName]) result[optionName] = this.options[optionName];
     }
 
-    if (this.resumeToken) {
-      Object.assign(result, { resumeAfter: this.resumeToken });
-    } else if (this.startAtOperationTime && maxWireVersion(this.server) >= 7) {
-      Object.assign(result, { startAtOperationTime: this.startAtOperationTime });
+    if (this.resumeToken || this.startAtOperationTime) {
+      ['resumeAfter', 'startAfter', 'startAtOperationTime'].forEach(key => delete result[key]);
+
+      if (this.resumeToken) {
+        result.resumeAfter = this.resumeToken;
+      } else if (this.startAtOperationTime && maxWireVersion(this.server) >= 7) {
+        result.startAtOperationTime = this.startAtOperationTime;
+      }
     }
 
     return result;