Quantity.set_equivalence_ratio and other special setters not working

[speth]

Problem description

Several "special" setters for Solution objects do not work on Quantity objects. While they appear to pass through the call to the parent Solution correctly, they don't update the state of the Quantity object afterwards. This affects at least set_equivalence_ratio, set_unnormalized_mass_fractions and set_unnormalized_mole_fractions. While the latter two are not that likely to be needed with Quantity, the first one is fairly important.

Steps to reproduce

>>> import cantera as ct
>>> gas = ct.Solution('gri30.yaml')
>>> q = ct.Quantity(gas)
>>> q.set_equivalence_ratio(0.8, 'CH4:1.0', 'O2:1.0, N2:3.76')
>>> q.equivalence_ratio()
inf
>>> q.mole_fraction_dict()
{'H2': 1.0}
>>> q.set_unnormalized_mass_fractions([1]*53)
>>> q.Y
array([1., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
       0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
       0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
       0., 0.])
>>> q.set_unnormalized_mole_fractions([1]*53)
>>> q.X
Out[11]: 
array([1., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
       0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
       0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
       0., 0.])

System information

• Cantera version: 2.6.0 or main at c54e429
• Python/MATLAB/other software versions: Python 3.11, though I presume this affects all versions

Additional context

Identified while trying to provide suggestions for this question on the Cantera Users' Group.

[ischoegl]

Confirmed on Python 3.10.5