Utility classes to allow for inclusion of "NULL" an a class instance, for memory efficiency. Each one of these is a class union between the underlying class ("integer", "character" and "numeric") and "NULL".
These classes are typically part of more complex classes representing outputs of ensemble fit functions.
No methods defined with class "OptionalInteger" in the signature.
Alireza S. Mahani, Mansour T.A. Sharabiani
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