[WIP] Fix DF cast pushdown

[AdamGS]

Just putting a test here while I figure out the bigger question here.

[codspeed-hq]

CodSpeed Performance Report

Merging this PR will degrade performance by 33.21%

_{Comparing adamg/issue-6211 (2ce043b) with develop (0d0fc63)}

Summary

❌ 1 regressed benchmark
✅ 1137 untouched benchmarks
⏩ 1265 skipped benchmarks¹

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

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	chunked_bool_into_canonical[(1000, 10)]	43 µs	64.4 µs	-33.21%

Footnotes

1. 1265 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩