Treat zero byte stream as a file. #1689

Job	Run time
Test slow test cases	58s
Test on aarch64	8m 8s
Test Python 3.8 on ubuntu-22.04	55s
Test Python 3.9 on ubuntu-22.04	2m 14s
Test Python 3.10 on ubuntu-22.04	58s
Test Python 3.11 on ubuntu-22.04	1m 5s
Test Python 3.12 on ubuntu-22.04	1m 43s
Test Python pypy-3.9 on ubuntu-22.04	2m 4s
Test Python 3.8 on windows-latest	2m 13s
Test Python 3.9 on windows-latest	3m 46s
Test Python 3.10 on windows-latest	2m 23s
Test Python 3.11 on windows-latest	1m 57s
Test Python 3.12 on windows-latest	4m 1s
Test Python 3.11 on macos-latest	2m 23s
finish parallel build	0s
	34m 48s

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