simplify ser-as-any mechanism #5156

Job	Run time
rust benchmarks	2m 14s
build on ${{ matrix.os }} (${{ matrix.target }} - ${{ matrix.interpreter \|\| 'all' }}${{ (((matrix.os == 'linux') && format(' - {0}', (((matrix.manylinux == 'auto') && 'manylinux') \|\| matrix.manylinux))) \|\| '') }})	0s
build pgo-optimized on ${{ matrix.os }} / ${{ matrix.interpreter }}	0s
build sdist	11s
build-wasm-emscripten	2m 18s
coverage	2m 2s
lint	48s
test-debug 3.11	55s
test-debug pypy3.10	1m 11s
test MSRV	2m 32s
test on ubuntu	1m 47s
test on macos	2m 31s
test-pydantic-integration	1m 40s
test on windows	4m 35s
test 3.8	1m 45s
test 3.9	1m 59s
test 3.10	1m 51s
test 3.11	1m 58s
test 3.12	2m 6s
test 3.13	2m 11s
test pypy3.9	2m 19s
test pypy3.10	2m 13s
test build on ${{ matrix.os }}	0s
test build on ${{ matrix.target }}-${{ matrix.distro }}	0s
inspect-pypi-assets	0s
check	3s
release	0s
	39m 9s

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