======
* 157: ``compare`` methods now validate their inputs
and will raise a more meaningful exception if an
empty string or None is passed. This expectation is now
documented.
* Many public methods now perform validation on arguments.
An empty string is no longer allowed for words or text.
Callers are expected to pass non-empty text or trap
the validation errors that are raised. The exceptions
raised are ``pydantic.error_wrappers.ValidationError``,
which are currently a subclass of ``ValueError``, but since
that
`may change <https://pydantic-docs.helpmanual.io/usage/validation_decorator/#validation-exception>`_,
tests check for a generic ``Exception``.