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jsonpickle extensions
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NumPy
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jsonpickle includes a built-in numpy extension.  If would like to encode
sklearn models, numpy arrays, and other numpy-based data then you must
enable the numpy extension by registering its handlers::

    >>> import jsonpickle.ext.numpy as jsonpickle_numpy
    >>> jsonpickle_numpy.register_handlers()

Ecdsa
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For the ecdsa module's keys, when trying to serialize them with
``gmpy2`` installed, jsonpickle will error unless the ``gmpy``
handlers are registered:

    >>> import jsonpickle.ext.gmpy as jsonpickle_gmpy
    >>> jsonpickle_gmpy.register_handlers()