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[DOC] Discourage use of USERDEF

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Nobuyoshi Nakada 2023-08-22 11:18:18 +09:00
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@ -301,6 +301,11 @@ sequence containing the user-defined representation of the object.
The class method +_load+ is called on the class with a string created from the The class method +_load+ is called on the class with a string created from the
byte-sequence. byte-sequence.
This type is not recommended for newly created classes, because of some
restrictions:
- cannot have recursive reference
=== User Marshal === User Marshal
"U" represents an object with a user-defined serialization format using the "U" represents an object with a user-defined serialization format using the