Merge pull request #2436 from ada-x64/chores/simplify-expr-serde #1560

Job	Run time
initialize	3s
build_pyodide (ubuntu-20.04)	13m 54s
lint_python (ubuntu-20.04, 3.9)	2m 29s
build_js (ubuntu-20.04, 3.9, 18.x)	10m 26s
test_js (ubuntu-20.04, 3.9, 18.x)	7m 34s
benchmark_js	0s
build_python (ubuntu-20.04, 3.9, 2014, 18.x, false, false)	16m 15s
test_python (ubuntu-20.04, 3.9, 18.x, false, false)	6m 36s
test_js_and_python (ubuntu-20.04, 3.9, 18.x)	4m 33s
test_python_sdist	0s
benchmark_python	0s
publish	0s
	1h 1m 50s

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