`Transform.xfm` is a list of lists and not a `np.ndarray`

[kroq-gar78]

Transform.xfm is wrongly annotated as npt.NDArray: https://github.com/gallantlab/pycortex/blob/main/cortex/xfm.py#L20

It is a list because we construct Transform directly with a JSON blob: https://github.com/gallantlab/pycortex/blob/main/cortex/database.py#L489

For example:

import cortex
print(cortex.db.S1.transforms['fullhead'].coord.xfm)

Output:

[[-0.44486981846094426, -0.0021363672818559996, -0.03721181986487324, 46.62686084588364], [0.005235315303737166, -0.44485768384714863, -0.03704886912935894, 60.165881316857195], [-0.02001550497747565, -0.020260819840215893, 0.24044994416882276, 12.698317611104553], [0.0, 0.0, 0.0, 1.0]]

Solution

Either fix the annotation to be list[list[float]] or convert it to np.ndarray during construction. I prefer the 2nd, but we need to check if that could mess up (de)serialization.