Backport PR #2067 on branch 0.12.x (Fix index types)

[meeseeksmachine]

Backport PR #2067: Fix index types

[codecov]

Codecov Report

❌ Patch coverage is 91.07143% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.55%. Comparing base (d5376df) to head (85fb1f2).
⚠️ Report is 30 commits behind head on 0.12.x.

Files with missing lines	Patch %	Lines
src/anndata/tests/helpers.py	81.81%	4 Missing ⚠️
src/anndata/_core/views.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           0.12.x    #2069      +/-   ##
==========================================
- Coverage   87.60%   85.55%   -2.06%     
==========================================
  Files          46       46              
  Lines        7052     7067      +15     
==========================================
- Hits         6178     6046     -132     
- Misses        874     1021     +147     

Files with missing lines	Coverage Δ
src/anndata/_core/anndata.py	83.07% <100.00%> (+0.17%)	⬆️
src/anndata/_core/index.py	92.65% <100.00%> (ø)
src/anndata/_core/raw.py	75.53% <100.00%> (-4.32%)	⬇️
src/anndata/_core/xarray.py	98.39% <100.00%> (ø)
src/anndata/compat/__init__.py	80.90% <100.00%> (+0.17%)	⬆️
src/anndata/_core/views.py	85.83% <87.50%> (-5.31%)	⬇️
src/anndata/tests/helpers.py	82.72% <81.81%> (-10.83%)	⬇️

... and 4 files with indirect coverage changes