Python 3.12 Test Summary
```
tests/test_core.py::test_groupby_agg_dask[464 failing variants]: IndexError: bool index 1 has shape (4,) instead of (3,)
tests/test_core.py::test_groupby_bins[4 failing variants]: IndexError: bool index 1 has shape (6,) instead of (3,)
tests/test_core.py::test_fill_value_behaviour[64 failing variants]: IndexError: bool index 1 has shape (2,) instead of (4,)
tests/test_core.py::test_find_cohorts_missing_groups: IndexError: bool index 1 has shape (4,) instead of (3,)
```
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Python 3.12 Test Summary
``` tests/test_core.py::test_groupby_agg_dask[464 failing variants]: IndexError: bool index 1 has shape (4,) instead of (3,) tests/test_core.py::test_groupby_bins[4 failing variants]: IndexError: bool index 1 has shape (6,) instead of (3,) tests/test_core.py::test_fill_value_behaviour[64 failing variants]: IndexError: bool index 1 has shape (2,) instead of (4,) tests/test_core.py::test_find_cohorts_missing_groups: IndexError: bool index 1 has shape (4,) instead of (3,) ```