[Python] How to use the StringAdapter in pycasbin

pycasbin includes a class StringAdapter in the file adapters/string_adapter.py, however, it doesn't seem to be useable.

Note that it is not an attribute of casbin.persist:

dir(casbin.persist)

['Adapter', 'BatchAdapter', 'FileAdapter', 'FilteredAdapter', 'FilteredFileAdapter', 'UpdateAdapter', '__builtins__', ...]

How can it be used ?

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