🙈 :nodoc: `AS::Duration::ISO8601Serializer`

This class should not be used directly, the public API is `AS::Duration#iso8601`.

activesupport/lib/active_support/duration/iso8601_serializer.rb

@@ -4,7 +4,7 @@
 module ActiveSupport
   class Duration
     # Serializes duration to string according to ISO 8601 Duration format.
-    class ISO8601Serializer
+    class ISO8601Serializer # :nodoc:
       def initialize(duration, precision: nil)
         @duration = duration
         @precision = precision