Add annotations for returned data #1033

Job	Run time
linters (3.9, ubuntu-latest)	1m 43s
Testing on Python 3.8 (ubuntu-latest)	1m 18s
Testing on Python 3.8 (macos-13)	1m 43s
Testing on Python 3.8 (windows-2019)	1m 30s
Testing on Python 3.9 (ubuntu-latest)	1m 25s
Testing on Python 3.9 (macos-13)	1m 34s
Testing on Python 3.9 (windows-2019)	1m 24s
Testing on Python 3.10 (ubuntu-latest)	1m 34s
Testing on Python 3.10 (macos-13)	1m 28s
Testing on Python 3.10 (windows-2019)	1m 32s
Testing on Python 3.11 (ubuntu-latest)	1m 34s
Testing on Python 3.11 (macos-13)	1m 35s
Testing on Python 3.11 (windows-2019)	1m 26s
Testing on Python 3.12 (ubuntu-latest)	1m 21s
Testing on Python 3.12 (macos-13)	1m 40s
Testing on Python 3.12 (windows-2019)	1m 29s
	24m 16s

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