Optimize constant casts to avoid unnecessary capabilities #529

Job	Run time
Android (ubuntu-24.04, aarch64-linux-android)	8m 19s
Lint	6m 19s
Difftest (ubuntu-24.04)	8m 19s
Test (macOS-latest)	5m 24s
Compiletest (windows-2022)	3m 49s
Compiletest (macOS-latest)	3m 42s
Difftest (macOS-latest)	6m 10s
Test (windows-2022)	10m 0s
cargo-deny	54s
Difftest (windows-2022)	9m 59s
Test (ubuntu-24.04)	8m 14s
Compiletest (ubuntu-24.04)	3m 57s
test_success	2s
	1h 15m 8s

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