DNM: Migrate stream to use classvar defaults #8857

Job	Run time
Linter	47s
Generate llhttp sources	9s
Benchmark	1m 37s
Test (3.9, ubuntu, false)	1s
Test (3.9, macos, false)	1s
Test (3.9, windows, false)	1s
Test (3.9, Y, ubuntu, false)	1s
Test (3.10, ubuntu, false)	25s
Test (3.10, macos, false)	25s
Test (3.10, windows, false)	23s
Test (3.10, Y, ubuntu, false)	26s
Test (3.11, ubuntu, false)	29s
Test (3.11, macos, false)	30s
Test (3.11, windows, false)	23s
Test (3.11, Y, ubuntu, false)	23s
Test (3.12, ubuntu, false)	26s
Test (3.12, macos, false)	30s
Test (3.12, windows, false)	23s
Test (3.12, Y, ubuntu, false)	25s
Test (3.13, ubuntu, false)	27s
Test (3.13, macos, false)	26s
Test (3.13, windows, false)	23s
Test (3.13, Y, ubuntu, false)	30s
Test (pypy-3.9, Y, ubuntu, false)	1s
check	4s
Pre-Deploy	0s
Build wheels on ${{ matrix.os }} ${{ matrix.qemu }}	0s
Tarball	0s
Deploy	0s
	9m 36s

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