Use a custom class for Uuid values

lib/rails_ext/active_record_uuid_type.rb

@@ -1,6 +1,30 @@
 # Custom UUID attribute type for MySQL binary storage with base36 string representation
 module ActiveRecord
   module Type
+    # Wrapper class to distinguish UUID binary values from regular binary strings
+    class UuidValue
+      def initialize(binary_string)
+        @value = binary_string
+      end
+
+      def to_s
+        @value
+      end
+
+      # Delegate methods needed for SQL quoting
+      def unpack1(format)
+        @value.unpack1(format)
+      end
+
+      def bytesize
+        @value.bytesize
+      end
+
+      def encoding
+        @value.encoding
+      end
+    end
+
     class Uuid < Binary
       BASE36_LENGTH = 25 # 36^25 > 2^128
 
@@ -16,6 +40,7 @@ module ActiveRecord
         hex = value.to_s.to_i(36).to_s(16).rjust(32, "0")
         binary = hex.scan(/../).map(&:hex).pack("C*")
         binary.force_encoding(Encoding::BINARY)
+        UuidValue.new(binary)
       end
 
       def deserialize(value)