diff --git a/ruby/ext/google/protobuf_c/ruby-upb.c b/ruby/ext/google/protobuf_c/ruby-upb.c
index 0fbb88d..80dc158 100644
--- a/ruby/ext/google/protobuf_c/ruby-upb.c
+++ b/ruby/ext/google/protobuf_c/ruby-upb.c
@@ -4580,14 +4580,14 @@
   return ext[index].ext;
 }
 
-const upb_Extension* upb_Message_FindExtensionByNumber(const upb_Message* msg,
-                                                       uint32_t field_number) {
+const upb_MiniTableExtension* upb_Message_FindExtensionByNumber(
+    const upb_Message* msg, uint32_t field_number) {
   size_t count;
   const upb_Extension* ext = UPB_PRIVATE(_upb_Message_Getexts)(msg, &count);
 
-  while (count--) {
-    if (upb_MiniTableExtension_Number(ext->ext) == field_number) return ext;
-    ext++;
+  for (; count--; ext++) {
+    const upb_MiniTableExtension* e = ext->ext;
+    if (upb_MiniTableExtension_Number(e) == field_number) return e;
   }
   return NULL;
 }
@@ -10605,10 +10605,10 @@
 
 // Must be last.
 
-const struct upb_Extension* UPB_PRIVATE(_upb_Message_Getext)(
+const upb_Extension* UPB_PRIVATE(_upb_Message_Getext)(
     const struct upb_Message* msg, const upb_MiniTableExtension* e) {
   size_t n;
-  const struct upb_Extension* ext = UPB_PRIVATE(_upb_Message_Getexts)(msg, &n);
+  const upb_Extension* ext = UPB_PRIVATE(_upb_Message_Getexts)(msg, &n);
 
   // For now we use linear search exclusively to find extensions.
   // If this becomes an issue due to messages with lots of extensions,
@@ -10622,11 +10622,11 @@
   return NULL;
 }
 
-const struct upb_Extension* UPB_PRIVATE(_upb_Message_Getexts)(
+const upb_Extension* UPB_PRIVATE(_upb_Message_Getexts)(
     const struct upb_Message* msg, size_t* count) {
   upb_Message_Internal* in = msg->internal;
   if (in) {
-    *count = (in->size - in->ext_begin) / sizeof(struct upb_Extension);
+    *count = (in->size - in->ext_begin) / sizeof(upb_Extension);
     return UPB_PTR_AT(in, in->ext_begin, void);
   } else {
     *count = 0;
@@ -10634,17 +10634,16 @@
   }
 }
 
-struct upb_Extension* UPB_PRIVATE(_upb_Message_GetOrCreateExtension)(
+upb_Extension* UPB_PRIVATE(_upb_Message_GetOrCreateExtension)(
     struct upb_Message* msg, const upb_MiniTableExtension* e, upb_Arena* a) {
-  struct upb_Extension* ext =
-      (struct upb_Extension*)UPB_PRIVATE(_upb_Message_Getext)(msg, e);
+  upb_Extension* ext = (upb_Extension*)UPB_PRIVATE(_upb_Message_Getext)(msg, e);
   if (ext) return ext;
-  if (!UPB_PRIVATE(_upb_Message_Realloc)(msg, sizeof(struct upb_Extension), a))
+  if (!UPB_PRIVATE(_upb_Message_Realloc)(msg, sizeof(upb_Extension), a))
     return NULL;
   upb_Message_Internal* in = msg->internal;
-  in->ext_begin -= sizeof(struct upb_Extension);
+  in->ext_begin -= sizeof(upb_Extension);
   ext = UPB_PTR_AT(in, in->ext_begin, void);
-  memset(ext, 0, sizeof(struct upb_Extension));
+  memset(ext, 0, sizeof(upb_Extension));
   ext->ext = e;
   return ext;
 }
diff --git a/ruby/ext/google/protobuf_c/ruby-upb.h b/ruby/ext/google/protobuf_c/ruby-upb.h
index a784587..5f95d20 100755
--- a/ruby/ext/google/protobuf_c/ruby-upb.h
+++ b/ruby/ext/google/protobuf_c/ruby-upb.h
@@ -1986,14 +1986,14 @@
 // This is rather wasteful for scalars (in the extreme case of bool,
 // it wastes 15 bytes). We accept this because we expect messages to be
 // the most common extension type.
-struct upb_Extension {
+typedef struct {
   const upb_MiniTableExtension* ext;
   union {
     upb_StringView str;
     void* ptr;
     char scalar_data[8];
   } data;
-};
+} upb_Extension;
 
 #ifdef __cplusplus
 extern "C" {
@@ -2002,18 +2002,18 @@
 // Adds the given extension data to the given message.
 // |ext| is copied into the message instance.
 // This logically replaces any previously-added extension with this number.
-struct upb_Extension* UPB_PRIVATE(_upb_Message_GetOrCreateExtension)(
+upb_Extension* UPB_PRIVATE(_upb_Message_GetOrCreateExtension)(
     struct upb_Message* msg, const upb_MiniTableExtension* ext,
     upb_Arena* arena);
 
 // Returns an array of extensions for this message.
 // Note: the array is ordered in reverse relative to the order of creation.
-const struct upb_Extension* UPB_PRIVATE(_upb_Message_Getexts)(
+const upb_Extension* UPB_PRIVATE(_upb_Message_Getexts)(
     const struct upb_Message* msg, size_t* count);
 
 // Returns an extension for a message with a given mini table,
 // or NULL if no extension exists with this mini table.
-const struct upb_Extension* UPB_PRIVATE(_upb_Message_Getext)(
+const upb_Extension* UPB_PRIVATE(_upb_Message_Getext)(
     const struct upb_Message* msg, const upb_MiniTableExtension* ext);
 
 #ifdef __cplusplus
@@ -2761,8 +2761,7 @@
 UPB_INLINE void _upb_Message_GetExtensionField(
     const struct upb_Message* msg, const upb_MiniTableExtension* mt_ext,
     const void* default_val, void* val) {
-  const struct upb_Extension* ext =
-      UPB_PRIVATE(_upb_Message_Getext)(msg, mt_ext);
+  const upb_Extension* ext = UPB_PRIVATE(_upb_Message_Getext)(msg, mt_ext);
   const upb_MiniTableField* f = &mt_ext->UPB_PRIVATE(field);
   UPB_ASSUME(upb_MiniTableField_IsExtension(f));
 
@@ -2785,7 +2784,7 @@
     struct upb_Message* msg, const upb_MiniTableExtension* mt_ext,
     const void* val, upb_Arena* a) {
   UPB_ASSERT(a);
-  struct upb_Extension* ext =
+  upb_Extension* ext =
       UPB_PRIVATE(_upb_Message_GetOrCreateExtension)(msg, mt_ext, a);
   if (!ext) return false;
   UPB_PRIVATE(_upb_MiniTableField_DataCopy)
@@ -2816,13 +2815,11 @@
     struct upb_Message* msg, const upb_MiniTableExtension* e) {
   upb_Message_Internal* in = msg->internal;
   if (!in) return;
-  const struct upb_Extension* base =
-      UPB_PTR_AT(in, in->ext_begin, struct upb_Extension);
-  struct upb_Extension* ext =
-      (struct upb_Extension*)UPB_PRIVATE(_upb_Message_Getext)(msg, e);
+  const upb_Extension* base = UPB_PTR_AT(in, in->ext_begin, upb_Extension);
+  upb_Extension* ext = (upb_Extension*)UPB_PRIVATE(_upb_Message_Getext)(msg, e);
   if (ext) {
     *ext = *base;
-    in->ext_begin += sizeof(struct upb_Extension);
+    in->ext_begin += sizeof(upb_Extension);
   }
 }
 
@@ -2991,7 +2988,6 @@
 
 // Must be last.
 
-typedef struct upb_Extension upb_Extension;
 typedef struct upb_Message upb_Message;
 
 #ifdef __cplusplus
@@ -12293,9 +12289,9 @@
 const upb_MiniTableExtension* upb_Message_ExtensionByIndex(
     const upb_Message* msg, size_t index);
 
-// Returns the extension with the given field number, or NULL on failure.
-const upb_Extension* upb_Message_FindExtensionByNumber(const upb_Message* msg,
-                                                       uint32_t field_number);
+// Returns the minitable with the given field number, or NULL on failure.
+const upb_MiniTableExtension* upb_Message_FindExtensionByNumber(
+    const upb_Message* msg, uint32_t field_number);
 
 #ifdef __cplusplus
 } /* extern "C" */
@@ -12390,9 +12386,9 @@
 
 UPB_INLINE bool _upb_sortedmap_nextext(_upb_mapsorter* s,
                                        _upb_sortedmap* sorted,
-                                       const struct upb_Extension** ext) {
+                                       const upb_Extension** ext) {
   if (sorted->pos == sorted->end) return false;
-  *ext = (const struct upb_Extension*)s->entries[sorted->pos++];
+  *ext = (const upb_Extension*)s->entries[sorted->pos++];
   return true;
 }
 
@@ -12404,9 +12400,8 @@
 bool _upb_mapsorter_pushmap(_upb_mapsorter* s, upb_FieldType key_type,
                             const struct upb_Map* map, _upb_sortedmap* sorted);
 
-bool _upb_mapsorter_pushexts(_upb_mapsorter* s,
-                             const struct upb_Extension* exts, size_t count,
-                             _upb_sortedmap* sorted);
+bool _upb_mapsorter_pushexts(_upb_mapsorter* s, const upb_Extension* exts,
+                             size_t count, _upb_sortedmap* sorted);
 
 #ifdef __cplusplus
 } /* extern "C" */
@@ -12459,6 +12454,35 @@
                                         const upb_Message* msg2,
                                         const upb_MiniTable* m);
 
+// Performs a shallow field comparison. Do not use on message types.
+UPB_API_INLINE bool upb_MessageValue_IsEqual(upb_MessageValue val1,
+                                             upb_MessageValue val2,
+                                             upb_CType ctype) {
+  switch (ctype) {
+    case kUpb_CType_Bool:
+      return val1.bool_val == val2.bool_val;
+
+    case kUpb_CType_Float:
+    case kUpb_CType_Int32:
+    case kUpb_CType_UInt32:
+    case kUpb_CType_Enum:
+      return val1.int32_val == val2.int32_val;
+
+    case kUpb_CType_Double:
+    case kUpb_CType_Int64:
+    case kUpb_CType_UInt64:
+      return val1.int64_val == val2.int64_val;
+
+    case kUpb_CType_String:
+    case kUpb_CType_Bytes:
+      return upb_StringView_IsEqual(val1.str_val, val2.str_val);
+
+    default:  // Note: This includes kUpb_CType_Message
+      UPB_ASSERT(0);
+      return false;
+  }
+}
+
 #ifdef __cplusplus
 } /* extern "C" */
 #endif