Cleanup internals #233

Job	Run time
Clippy (stable)	9s
Check (stable)	7s
Rustfmt (stable)	7s
Test Suite (stable)	49s
Test Suite (stable, --no-default-features)	55s
Test Suite (stable, --features track-caller)	38s
Test Suite (stable, --features pyo3)	43s
Test Suite (stable, --features auto-install)	36s
Test Suite (stable, --all-features)	45s
Test Suite (beta)	55s
Test Suite (beta, --no-default-features)	50s
Test Suite (beta, --features track-caller)	59s
Test Suite (beta, --features pyo3)	46s
Test Suite (beta, --features auto-install)	54s
Test Suite (beta, --all-features)	1m 4s
Test Suite (nightly)	57s
Test Suite (nightly, --no-default-features)	1m 4s
Test Suite (nightly, --features track-caller)	1m 3s
Test Suite (nightly, --features pyo3)	1m 14s
Test Suite (nightly, --features auto-install)	1m 16s
Test Suite (nightly, --all-features)	1m 11s
Test Suite	1m 20s
Test Suite (--no-default-features)	1m 56s
Test Suite (--features track-caller)	1m 25s
Test Suite (--features auto-install)	1m 59s
Test Suite (ubuntu-latest)	35s
Test Suite (windows-latest)	2m 13s
Test Suite (macOS-latest)	1m 8s
	27m 38s

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