Lxdx

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* New `set_by_path()` method to set value by path

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* Fix: must not alter data type during init
* New function
- ``reverse()``
* More documentation
* Rename ``get()`` to ``getx()`` to not interfere with original functionality.
* Fix error when object is passed to ``copy.deepcopy()``.
* Fix consumption of iterators in ``__new__()``.

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* Support for Python 3.10
* Selected functions accept multiple keys as args
* Add metadata flagging to items
* Supplementary functions for metadata
- ``keymeta()``
- ``whats_hidden()``
* Additional methods
- ``get_from()``

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* Normalisation of keys
* Dot notation accessibility due to keys normalisation
* Supporting the union operator (``|``) for ``dict``, (PEP-584_)
* Additional methods
- ``is_submap_of()``
- ``is_supermap_of()``
- ``dict()``
- ``from_json()``
- ``json()``


.. references
.. _PEP-584: https://www.python.org/dev/peps/pep-0584