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PRIVATE MODULE: do not import (from) it directly.
This module contains functionality for validating objects.
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Set a validator function for the given ``cls``. The function should accept
an instance of the type it should validate and must return ``False`` or
raise any exception in case of a validation failure.
:param func: the function that takes an instance of type ``cls`` and
returns a bool (``True`` if the validation was successful).
:param cls: the type or types that ``func`` is able to validate.
:param fork_inst: if given, it uses this fork of ``JsonSerializable``.
:return: None.
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Return the validator function that would be used for the given ``cls``.
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Validate the given ``obj`` with the validator that was registered for
``cls``. Raises a ``ValidationError`` if the validation failed.
:param obj: the object that is to be validated.
:param cls: the type of which the validator function was registered.
:param fork_inst: if given, it uses this fork of ``JsonSerializable``.
:return: None.
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