{@link PackWriter} allocates these objects to keep track of theper-object state, and how to load the objects efficiently into the generated stream. Implementers may subclass this type with additional object state, such as to remember what file and offset contains the object's pack encoded data. @param obj identity of the object that will be packed. The object's parsed status is undefined here. Implementers must not rely on the object being parsed. @return a new instance for this object.
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