Clean up enumeration on macOS #479

Job	Run time
cargo-deny (advisories)	18s
lint	34s
cargo-deny (bans licenses sources)	15s
aarch64-apple-darwin / build	27s
aarch64-apple-darwin-nightly / build	32s
aarch64-apple-ios / build	22s
aarch64-unknown-linux-gnu / build	35s
aarch64-unknown-linux-musl / build	1m 20s
arm-linux-androideabi / build	27s
armv7-linux-androideabi / build	26s
i686-pc-windows-msvc / build	1m 53s
i686-pc-windows-gnu / build	3m 23s
i686-unknown-linux-gnu / build	32s
i686-unknown-linux-musl / build	55s
msrv-aarch64-apple-darwin / build	36s
msrv-arm-linux-androideabi / build	42s
msrv-x86_64-unknown-freebsd / build	42s
msrv-x86_64-pc-windows-msvc / build	40s
msrv-x86_64-unknown-linux-gnu / build	1m 8s
msrv-x86_64-unknown-linux-musl / build	40s
msrv-x86_64-unknown-netbsd / build	39s
x86_64-apple-darwin / build	49s
x86_64-pc-windows-gnu / build	2m 29s
x86_64-pc-windows-msvc / build	1m 30s
x86_64-pc-windows-msvc-nightly / build	1m 6s
x86_64-unknown-freebsd / build	21s
x86_64-unknown-linux-gnu / build	1m 10s
x86_64-unknown-linux-musl / build	58s
x86_64-unknown-linux-gnu-nightly / build	35s
x86_64-unknown-netbsd / build	23s
	26m 27s

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