convert integers indexes to `int32`

[giovp]

this is cause there is no signed int64 in javascript. Check https://github.com/gzuidhof/zarr.js/blob/1002181a4c6b5411e20fe2bd54533a4c75b4bbcc/src/nestedArray/types.ts#L39-L67

this should happen at anndata and shapes/points level

[Bisaloo]

FWIW, R doesn't have int64 either.

When reading Zarr data with int64, we internally convert it to int32 if the max doesn't exceed what can be stored int32. Using int32 out of the box where possible would slightly improve performance for us as we wouldn't have to convert them.

[LucaMarconato]

Thanks for reporting. We could use this helper function

spatialdata/src/spatialdata/models/_utils.py

Line 417 in 06e6981

def _get_uint_dtype(value: int) -> str:

Related: in reworking with dtypes we should also relax this unnecessary constraint:

spatialdata/src/spatialdata/_core/operations/rasterize.py

Line 737 in 06e6981

if max_label > max_uint16:

.