`KeyError: 'millimeter_Hg'` from unit_conversion.py

[caufieldjh]

With a fresh install of either linkml-map 0.3.8 or 0.3.9-rc1, I get a KeyError when doing anything with the module (in this case, running through Poetry and Python 3.12.3):

$ poetry run linkml-map --help
Traceback (most recent call last):
  File "/home/harry/.cache/pypoetry/virtualenvs/brc-schema-ab5IJ14Z-py3.12/bin/linkml-map", line 5, in <module>
    from linkml_map.cli.cli import main
  File "/home/harry/.cache/pypoetry/virtualenvs/brc-schema-ab5IJ14Z-py3.12/lib/python3.12/site-packages/linkml_map/__init__.py", line 1, in <module>
    from linkml_map.transformer.object_transformer import ObjectTransformer
  File "/home/harry/.cache/pypoetry/virtualenvs/brc-schema-ab5IJ14Z-py3.12/lib/python3.12/site-packages/linkml_map/transformer/object_transformer.py", line 19, in <module>
    from linkml_map.functions.unit_conversion import UnitSystem, convert_units
  File "/home/harry/.cache/pypoetry/virtualenvs/brc-schema-ab5IJ14Z-py3.12/lib/python3.12/site-packages/linkml_map/functions/unit_conversion.py", line 28, in <module>
    UnitSystem.UCUM: PintUcumRegistry(),
                     ^^^^^^^^^^^^^^^^^^
  File "/home/harry/.cache/pypoetry/virtualenvs/brc-schema-ab5IJ14Z-py3.12/lib/python3.12/site-packages/pint/facets/plain/registry.py", line 158, in __call__
    obj._after_init()
  File "/home/harry/.cache/pypoetry/virtualenvs/brc-schema-ab5IJ14Z-py3.12/lib/python3.12/site-packages/ucumvert/ucum_pint.py", line 351, in _after_init
    loaded_files = self.load_definitions(
                   ^^^^^^^^^^^^^^^^^^^^^^
  File "/home/harry/.cache/pypoetry/virtualenvs/brc-schema-ab5IJ14Z-py3.12/lib/python3.12/site-packages/pint/facets/plain/registry.py", line 604, in load_definitions
    self._helper_dispatch_adder(definition)
  File "/home/harry/.cache/pypoetry/virtualenvs/brc-schema-ab5IJ14Z-py3.12/lib/python3.12/site-packages/pint/facets/plain/registry.py", line 502, in _helper_dispatch_adder
    adder_func(definition)
  File "/home/harry/.cache/pypoetry/virtualenvs/brc-schema-ab5IJ14Z-py3.12/lib/python3.12/site-packages/pint/facets/plain/registry.py", line 556, in _add_alias
    unit = unit_dict[definition.name]
           ~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/collections/__init__.py", line 1015, in __getitem__
    return self.__missing__(key)            # support subclasses that define __missing__
           ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/collections/__init__.py", line 1007, in __missing__
    raise KeyError(key)
KeyError: 'millimeter_Hg'

Looks like the issue is upstream in pint and/or somewhere else.
I'll open a quick-fix PR but I'm guessing there's something else going on with unit conversions. Just need a new release.

[caufieldjh]

I do not see this error when installing w/ uv directly from the repo version (and Python 3.11.13)

[caufieldjh]

This error was on my end - the initial install had provided an outdated version of ucumvert. Closing.

[cmungall]

This wasn't your problem - ucumvert was pinned way too tightly.

We still need the loosen the leash a little. See #107