Make `get` const (#14751) #640

Job	Run time
plugins (windows-latest)	13m 18s
std-lib-and-python-virtualenv (ubuntu-20.04, py)	4m 15s
plugins (macos-13)	14m 33s
tests (windows-latest)	8m 24s
std-lib-and-python-virtualenv (macos-latest, py)	4m 5s
plugins (ubuntu-20.04)	6m 31s
tests (macos-latest)	6m 39s
fmt-clippy (windows-latest)	8m 22s
std-lib-and-python-virtualenv (windows-latest, py)	11m 21s
tests (ubuntu-20.04)	6m 33s
fmt-clippy (macos-13)	4m 37s
fmt-clippy (ubuntu-20.04)	3m 8s
Build WASM	2m 12s
Clippy WASM	2m 11s
	1h 36m 9s

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