penguin-wwy commented on code in PR #1942:
URL: https://github.com/apache/fury/pull/1942#discussion_r1844943776


##########
python/pyfury/_serialization.pyx:
##########
@@ -1644,29 +1664,143 @@ cdef class CollectionSerializer(Serializer):
     cpdef int16_t get_xtype_id(self):
         return -FuryType.LIST.value
 
+    cdef pair[int8_t, int64_t] write_header(self, Buffer buffer, value):
+        cdef int8_t collect_flag = COLLECTION_DEFAULT_FLAG
+        elem_type = type(next(iter(value)))
+        for s in value:
+            if type(s) is not elem_type:
+                collect_flag |= COLLECTION_NOT_SAME_TYPE
+                break
+        if self.fury.ref_tracking:
+            collect_flag |= COLLECTION_TRACKING_REF
+        buffer.write_varint64((len(value) << 4) | collect_flag)
+        return pair[int8_t, int64_t](collect_flag, obj2int(elem_type))
+
     cpdef write(self, Buffer buffer, value):
-        buffer.write_varint32(len(value))
+        if len(value) == 0:
+            buffer.write_varint64(0)
+            return
+        cdef pair[int8_t, int64_t] header_pair = self.write_header(buffer, 
value)
+        cdef int8_t collect_flag = header_pair.first
+        cdef int64_t elem_type_ptr = header_pair.second
+        cdef elem_type = <type>int2obj(elem_type_ptr)
         cdef MapRefResolver ref_resolver = self.ref_resolver
         cdef ClassResolver class_resolver = self.class_resolver
+        if (collect_flag & COLLECTION_NOT_SAME_TYPE) == 0:
+            if elem_type is str:

Review Comment:
   Done, write the type flag only once for primitive types



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