* Enhancement: ``pypfilt.cache.load_state()`` now issues a ``UserWarning`` when non-finite values are found in a cached state, or in the simulation context.
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Observations and lookup table values should be finite, and non-finite values are not equal to themselves, so they also interfere with the caching system.
Note that this **does not change** the value returned by ``pypfilt.cache.load_state()``.
* Enhancement: add a new convenience function ``pypfilt.examples.lorenz.save_lorenz63_scenario_files()`` to save all of the example Lorenz-63 scenario files in the working directory.
* Documentation: demonstrate how to evaluate forecast performance with ``pypfilt.crps.simulated_obs_crps()``.
* Documentation: demonstrate how to use cache files to reuse particle state vectors.