multiplicity parameter of Turbomole calculator should not require units

A turbomole calculator, set up according to the example from vre-language/examples/h2o_tm.vm, would look similar to:

calc1 = Calculator turbomole (
        (task: 'optimize'),
        ('total charge': 0),
        (multiplicity: 1),
        ('use dft': true),
        ('use resolution of identity': true)
)

This currently produces the following error message when a model is run employing such calculator

    raise TextXError(str(err), **loc, context=con) from err
textx.exceptions.TextXError: /home/my_path/tst-turbomole/tst-h2o_tm.vm:26:9: multiplicity not defined => 'Calculator turbomole (
        (task: 'frequencies'),
        ('total charge': 0),
        (multiplicity: 1),
        ('use dft': true),
        ('use resolution of identity': true)
)'

A strange workaround is possible by adding dimensionless units to the multiplicity property, like so:

calc1 = Calculator turbomole (
        (task: 'optimize'),
        ('total charge': 0),
        (multiplicity: 1[dimensionless]),
        ('use dft': true),
        ('use resolution of identity': true)
)

With this fix the model runs without problems.

As far as I understand, [dimensionless] is assumed whenever units are not explicitly employed, so having to add [dimensionless] units to multiplicity does not make much sense.

For reproducibility, a test sample script is attached to this issutst-h2o_tm.vm: