ValueHashedFields.require_parameters_are_fields
===============================================

.. py:method:: t3toolbox.backend.common.ValueHashedFields.require_parameters_are_fields()

   .. code-block:: python

      def require_parameters_are_fields(self) -> None:


   Reject a parameter that was stashed on the instance instead of declared as a **field**.

   The value identity is built from ``dc.fields(self)``, so anything else an instance carries is
   invisible to it -- two objects that differ only in such a value compare EQUAL, and since these
   objects are jax ``aux_data`` one of them silently receives the other's compiled program. That
   makes "parameters are fields" a correctness rule, not a style preference, and this turns the
   three ways of breaking it (a hand-written ``__init__``, a bare class attribute assigned per
   instance, a class that forgot its ``@dataclass`` decorator) into a construction-time error.

   Call it from ``__post_init__``. Values cached by ``functools.cached_property`` also live in
   ``__dict__`` by design and are skipped -- they are derived, never parameters.