diff --git a/packages/ejson/ejson.js b/packages/ejson/ejson.js
index a4670297d2..25efbc761d 100644
--- a/packages/ejson/ejson.js
+++ b/packages/ejson/ejson.js
@@ -486,10 +486,16 @@ EJSON.equals = (a, b, options) => {
     return b.equals(a, options);
   }
 
-  if (a instanceof Array) {
-    if (!(b instanceof Array)) {
-      return false;
-    }
+  // Array.isArray works across iframes while instanceof won't
+  const aIsArray = Array.isArray(a);
+  const bIsArray = Array.isArray(b);
+
+  // if not both or none are array they are not equal
+  if (aIsArray !== bIsArray) {
+    return false;
+  }
+
+  if (aIsArray && bIsArray) {
     if (a.length !== b.length) {
       return false;
     }
diff --git a/packages/ejson/ejson_tests.js b/packages/ejson/ejson_tests.js
index eb246742c6..aaad7aa103 100644
--- a/packages/ejson/ejson_tests.js
+++ b/packages/ejson/ejson_tests.js
@@ -44,6 +44,14 @@ Tinytest.add('ejson - some equality tests', test => {
   test.isFalse(EJSON.equals({a: 1, b: 2, c: 3}, {a: 1, c: 3, b: 4}));
   test.isFalse(EJSON.equals({a: {}}, {a: {b: 2}}));
   test.isFalse(EJSON.equals({a: {b: 2}}, {a: {}}));
+  // XXX: Object and Array were previously mistaken, which is why
+  // we add some extra tests for them here
+  test.isTrue(EJSON.equals([1, 2, 3, 4, 5], [1, 2, 3, 4, 5]));
+  test.isFalse(EJSON.equals([1, 2, 3, 4, 5], [1, 2, 3, 4]));
+  test.isFalse(EJSON.equals([1,2,3,4], {0: 1, 1: 2, 2: 3, 3: 4}));
+  test.isFalse(EJSON.equals({0: 1, 1: 2, 2: 3, 3: 4}, [1,2,3,4]));
+  test.isFalse(EJSON.equals({}, []));
+  test.isFalse(EJSON.equals([], {}));
 });
 
 Tinytest.add('ejson - equality and falsiness', test => {
diff --git a/packages/mongo/oplog_v2_converter.js b/packages/mongo/oplog_v2_converter.js
index c7576087c5..42c67703e7 100644
--- a/packages/mongo/oplog_v2_converter.js
+++ b/packages/mongo/oplog_v2_converter.js
@@ -94,12 +94,11 @@ function flattenObject(ob) {
   for (const i in ob) {
     if (!ob.hasOwnProperty(i)) continue;
 
-    if (typeof ob[i] == 'object' && ob[i] !== null) {
+    if (!Array.isArray(ob[i]) && typeof ob[i] == 'object' && ob[i] !== null) {
       const flatObject = flattenObject(ob[i]);
-      if(Object.keys(flatObject).length === 0) { return ob; }
-      for (const x in flatObject) {
-        if (!flatObject.hasOwnProperty(x)) continue;
-
+      let objectKeys = Object.keys(flatObject);
+      if(objectKeys.length === 0) { return ob; }
+      for (const x of objectKeys) {
         toReturn[i + '.' + x] = flatObject[x];
       }
     } else {
diff --git a/packages/mongo/oplog_v2_converter_tests.js b/packages/mongo/oplog_v2_converter_tests.js
index 602e82cb6f..5a230989d1 100644
--- a/packages/mongo/oplog_v2_converter_tests.js
+++ b/packages/mongo/oplog_v2_converter_tests.js
@@ -98,6 +98,12 @@ Tinytest.add('oplog - v2/v1 conversion', function(test) {
     JSON.stringify({ $v: 2, $set: { 'services.resume.loginTokens': [] } })
   );
 
+  const entry91 = { "$v" : 2, "diff" : { "i" : { "tShirt" : { "sizes" : [ "small", "medium", "large" ] } } } };
+  test.equal(
+    JSON.stringify(oplogV2V1Converter(entry91)),
+    JSON.stringify({ $v: 2, $set: { "tShirt.sizes" : [ "small", "medium", "large" ] } })
+  );
+
   const entry10 = {
     $v: 2,
     $set: {
diff --git a/packages/mongo/package.js b/packages/mongo/package.js
index 55aae6cdc3..3bc6b4e36e 100644
--- a/packages/mongo/package.js
+++ b/packages/mongo/package.js
@@ -9,7 +9,7 @@
 
 Package.describe({
   summary: "Adaptor for using MongoDB and Minimongo over DDP",
-  version: '1.14.1'
+  version: '1.14.2'
 });
 
 Npm.depends({