Clean up enumeration on macOS #484

Job	Run time
cargo-deny (advisories)	17s
lint	26s
cargo-deny (bans licenses sources)	27s
aarch64-apple-ios / build	25s
aarch64-apple-darwin / build	27s
aarch64-apple-darwin-nightly / build	26s
aarch64-unknown-linux-musl / build	55s
aarch64-unknown-linux-gnu / build	1m 7s
arm-linux-androideabi / build	27s
armv7-linux-androideabi / build	50s
i686-pc-windows-gnu / build	2m 8s
i686-pc-windows-msvc / build	2m 48s
i686-unknown-linux-gnu / build	42s
i686-unknown-linux-musl / build	1m 17s
msrv-aarch64-apple-darwin / build	53s
msrv-arm-linux-androideabi / build	37s
msrv-x86_64-pc-windows-msvc / build	50s
msrv-x86_64-unknown-freebsd / build	38s
msrv-x86_64-unknown-linux-gnu / build	25s
msrv-x86_64-unknown-linux-musl / build	1m 4s
msrv-x86_64-unknown-netbsd / build	37s
x86_64-apple-darwin / build	40s
x86_64-pc-windows-gnu / build	3m 10s
x86_64-pc-windows-msvc / build	2m 15s
x86_64-pc-windows-msvc-nightly / build	1m 16s
x86_64-unknown-linux-gnu / build	1m 5s
x86_64-unknown-freebsd / build	39s
x86_64-unknown-linux-gnu-nightly / build	34s
x86_64-unknown-linux-musl / build	56s
x86_64-unknown-netbsd / build	35s
	28m 56s

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