In python 3.12 these are now Syntax Errors instead of Deprecation warnings.

…that come with pint.

…a unify dash.

The tests previously weren't working correctly. Specifically when doing Quantity('-123') with a unify dash, pint would actually return the Quantity('123'). The test doesn't catch this, as the test is effectively doing Quantity($input) == Quantity($input).

With Python 3.12, the internals of Quantity changed, to explictly reject unify dashes, instead of silently skipping them.

In pint 0.21 ppm was officially added, named ppm, instead of parts_per_million.

…into explict.

…ercentage values.

For example

     'Melting point: 75% -17.5 °C; 80% 4.6 °C; 85% 21 °C.' will now return
        [Quantity('75%'), Quantity('-17.5 degC')],
        [Quantity("80%"), Quantity('4.6 degC')],
        [Quantity("85%"), Quantity('21 degC')],
     Where previously it returned just `Quantity("4.6 degC")`.

All other examples continue to work the way they did before. But strings such as "10%" will also work now.