refactor: improve type docstrings and remove internal type exports #347

Job	Run time
checks / readme-snippets	13s
checks / pre-commit	35s
checks / test (3.10, lowest-direct, windows-latest)	2m 36s
checks / test (3.11, lowest-direct, windows-latest)	2m 37s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 14s
checks / test (3.14, locked, windows-latest)	3m 4s
checks / test (3.10, locked, windows-latest)	2m 24s
checks / test (3.14, locked, ubuntu-latest)	2m 19s
checks / test (3.13, locked, ubuntu-latest)	46s
checks / test (3.11, lowest-direct, ubuntu-latest)	52s
checks / test (3.12, lowest-direct, windows-latest)	3m 38s
checks / test (3.13, lowest-direct, windows-latest)	2m 45s
checks / test (3.12, lowest-direct, ubuntu-latest)	59s
checks / test (3.11, locked, windows-latest)	2m 27s
checks / test (3.14, lowest-direct, windows-latest)	2m 36s
checks / test (3.13, lowest-direct, ubuntu-latest)	52s
checks / test (3.10, locked, ubuntu-latest)	50s
checks / test (3.11, locked, ubuntu-latest)	47s
checks / test (3.12, locked, ubuntu-latest)	53s
checks / test (3.13, locked, windows-latest)	2m 26s
checks / test (3.12, locked, windows-latest)	3m 28s
checks / test (3.10, lowest-direct, ubuntu-latest)	56s
all-green	4s
	39m 21s

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