fix warning for tuple of wrong size in union #4257

Job	Run time
build on ${{ matrix.os }} (${{ matrix.target }} - ${{ matrix.interpreter \|\| 'all' }}${{ (((matrix.os == 'linux') && format(' - {0}', (((matrix.manylinux == 'auto') && 'manylinux') \|\| matrix.manylinux))) \|\| '') }})	0s
rust benchmarks	3m 24s
build pgo-optimized on ${{ matrix.os }} / ${{ matrix.interpreter }}	0s
build sdist	11s
build-wasm-emscripten	2m 45s
coverage	3m 5s
lint	52s
test-debug 3.11	1m 2s
test on ubuntu	2m 32s
test-pydantic-integration	1m 28s
test-debug pypy3.10	1m 21s
test on macos	5m 36s
test on windows	5m 1s
test 3.8	2m 17s
test 3.9	2m 22s
test 3.10	2m 3s
test 3.11	2m 11s
test 3.12	2m 14s
test pypy3.9	2m 33s
test pypy3.10	2m 36s
test build on ${{ matrix.target }}-${{ matrix.distro }}	0s
test build on ${{ matrix.os }}	0s
inspect-pypi-assets	0s
check	3s
release	0s
	43m 36s

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