pkg: add minimal type lints. #41

Job	Run time
Native (macos-latest, 14.x)	2m 13s
Javascript & Bigint (14.x, test-js)	5m 42s
Native w/ Torsion (macos-latest, 14.x)	2m 12s
Browser	9m 4s
Native (macos-latest, 16.x)	2m 30s
Javascript & Bigint (14.x, test-bigint)	3m 48s
Native w/ Torsion (macos-latest, 16.x)	2m 13s
Native (macos-latest, 18.x)	2m 17s
Javascript & Bigint (16.x, test-js)	5m 17s
Native w/ Torsion (macos-latest, 18.x)	4m 0s
Native (macos-latest, 20.x)	2m 34s
Lint	1m 6s
Native w/ Torsion (macos-latest, 20.x)	2m 40s
Javascript & Bigint (16.x, test-bigint)	3m 22s
Native (ubuntu-latest, 14.x)	2m 17s
Native w/ Torsion (ubuntu-latest, 14.x)	1m 39s
Javascript & Bigint (18.x, test-js)	5m 41s
Native (ubuntu-latest, 16.x)	1m 32s
Native w/ Torsion (ubuntu-latest, 16.x)	2m 2s
Javascript & Bigint (18.x, test-bigint)	3m 34s
Native (ubuntu-latest, 18.x)	1m 32s
Native w/ Torsion (ubuntu-latest, 18.x)	1m 46s
Javascript & Bigint (20.x, test-js)	5m 12s
Native (ubuntu-latest, 20.x)	1m 41s
Native w/ Torsion (ubuntu-latest, 20.x)	2m 3s
Javascript & Bigint (20.x, test-bigint)	2m 50s
	1h 20m 47s

Provide feedback