Cleanup internals #235

Job	Run time
Test Suite	1m 45s
Test Suite (--no-default-features)	1m 48s
Test Suite (--features track-caller)	1m 47s
Test Suite (--features auto-install)	1m 48s
Check (stable)	6s
Rustfmt (stable)	7s
Test Suite (stable)	44s
Test Suite (stable, --no-default-features)	41s
Test Suite (stable, --features track-caller)	57s
Test Suite (stable, --features pyo3)	48s
Test Suite (stable, --features auto-install)	46s
Test Suite (stable, --all-features)	50s
Test Suite (beta)	52s
Test Suite (beta, --no-default-features)	44s
Test Suite (beta, --features track-caller)	51s
Test Suite (beta, --features pyo3)	46s
Test Suite (beta, --features auto-install)	52s
Test Suite (beta, --all-features)	56s
Test Suite (nightly)	1m 7s
Test Suite (nightly, --no-default-features)	1m 11s
Test Suite (nightly, --features track-caller)	1m 8s
Test Suite (nightly, --features pyo3)	1m 0s
Test Suite (nightly, --features auto-install)	57s
Test Suite (nightly, --all-features)	1m 12s
Test Suite (ubuntu-latest)	49s
Test Suite (windows-latest)	2m 16s
Test Suite (macOS-latest)	1m 27s
Clippy (stable)	20s
	28m 35s

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