build

If the `---@field` of the same name has a type of `fun`, the `duplica… #4440

Job	Run time
compile (ubuntu-22.04, linux, linux-x64, alpine:latest, musl)	2m 9s
compile (ubuntu-20.04, linux, linux-x64)	4m 7s
compile (ubuntu-20.04, linux, linux-arm64)	1m 21s
compile (macos-latest, darwin, darwin-x64)	1m 28s
compile (macos-latest, darwin, darwin-arm64)	1m 50s
compile (windows-latest, windows, win32-ia32)	3m 20s
compile (windows-latest, windows, win32-x64)	3m 12s
	17m 27s

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