fix: Close streaming connections deterministically where the platform allows #151

Job	Run time
linux (3.13)	48s
floor (lowest-direct deps) (windows-latest)	1m 21s
linux (3.14)	48s
linux (3.10)	45s
windows (3.13)	1m 33s
linux (3.12)	45s
windows (3.14)	1m 26s
linux (3.11)	47s
windows (3.10)	1m 33s
windows (3.11)	1m 30s
floor (lowest-direct deps) (ubuntu-latest)	15s
windows (3.12)	1m 57s
	13m 28s

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