fix compile error in bytes feature #873

Job	Run time
test (ubuntu-latest, 2.7, 1.61)	10m 52s
test (ubuntu-latest, 2.7, stable)	4m 49s
test (ubuntu-latest, 3.0, 1.61)	11m 21s
test (ubuntu-latest, 3.0, stable)	5m 5s
test (ubuntu-latest, 3.1, 1.61)	10m 33s
test (ubuntu-latest, 3.1, stable)	4m 47s
test (ubuntu-latest, 3.2, 1.61)	10m 14s
test (ubuntu-latest, 3.2, stable)	6m 7s
test (ubuntu-latest, head, 1.61)	10m 18s
test (ubuntu-latest, head, stable)	4m 52s
test (macos-latest, 2.7, 1.61)	15m 42s
test (macos-latest, 2.7, stable)	7m 18s
test (macos-latest, 3.0, 1.61)	14m 35s
test (macos-latest, 3.0, stable)	7m 44s
test (macos-latest, 3.1, 1.61)	14m 18s
test (macos-latest, 3.1, stable)	8m 0s
test (macos-latest, 3.2, 1.61)	13m 36s
test (macos-latest, 3.2, stable)	6m 26s
test (macos-latest, head, 1.61)	11m 45s
test (macos-latest, head, stable)	5m 0s
test (windows-latest, 2.7, 1.61)	6m 22s
test (windows-latest, 2.7, stable)	6m 25s
test (windows-latest, 3.0, 1.61)	7m 51s
test (windows-latest, 3.0, stable)	8m 11s
test (windows-latest, 3.1, 1.61)	9m 5s
test (windows-latest, 3.1, stable)	4m 49s
test (windows-latest, 3.2, 1.61)	6m 50s
test (windows-latest, 3.2, stable)	11m 46s
test (windows-latest, mswin, stable)	17m 54s
	4h 22m 35s

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