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`PR 221 Remove embeds of unmappable properties <https://github.com/4dn-dcic/snovault/pull/221>`_
* Here, we remove embeds of properties that cannot be mapped within our system,
namely those that fall under ``additionalProperties`` or ``patternProperties`` in our schema.
* As far as I understand things, since these fields cannot be mapped, adding them to an item's embedding list
will not work regardless of the changes here, specifically the explicit removal of the properties
from the default embeds in ``find_default_embeds_for_schema``.
Thus, no properties in the schema defined under ``additionalProperties`` or ``patternProperties`` can be embedded
or used for invalidation scope with our current set-up,
and significant refactoring would be required to make these work.