[DOCS] Casting matrix

[colin-ho]

[codspeed-hq]

CodSpeed Performance Report

Merging #2801 will degrade performances by 13.36%

_{Comparing colin/casting-matrix (6ad9fe4) with main (e3fbf88)}

Summary

⚡ 1 improvements
❌ 1 regressions
✅ 14 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	colin/casting-matrix	Change
❌	test_count[1 Small File]	20.5 ms	23.6 ms	-13.36%
⚡	test_show[100 Small Files]	298.8 ms	48.7 ms	×6.1

[jaychia]

is there a test or something that can help us validate this?

[colin-ho]

is there a test or something that can help us validate this?

We don't have a centralized location for testing all possible casting combinations yet. The best is tests/series/test_cast.py but this is limited to certain dtypes only.

I'll augment that file to make sure it covers everything, and then it can serve as our 'Master' casting validation test file.