Clean up enumeration on macOS #482

Job	Run time
cargo-deny (advisories)	16s
lint	31s
cargo-deny (bans licenses sources)	15s
aarch64-apple-darwin / build	38s
aarch64-apple-ios / build	21s
aarch64-apple-darwin-nightly / build	27s
aarch64-unknown-linux-gnu / build	28s
aarch64-unknown-linux-musl / build	51s
arm-linux-androideabi / build	21s
armv7-linux-androideabi / build	22s
i686-pc-windows-gnu / build	1m 59s
i686-pc-windows-msvc / build	3m 54s
i686-unknown-linux-gnu / build	46s
i686-unknown-linux-musl / build	1m 9s
msrv-aarch64-apple-darwin / build	41s
msrv-arm-linux-androideabi / build	40s
msrv-x86_64-pc-windows-msvc / build	42s
msrv-x86_64-unknown-freebsd / build	1m 2s
msrv-x86_64-unknown-linux-musl / build	1m 3s
msrv-x86_64-unknown-linux-gnu / build	32s
msrv-x86_64-unknown-netbsd / build	55s
x86_64-apple-darwin / build	46s
x86_64-pc-windows-gnu / build	2m 39s
x86_64-pc-windows-msvc / build	3m 3s
x86_64-pc-windows-msvc-nightly / build	1m 11s
x86_64-unknown-freebsd / build	32s
x86_64-unknown-linux-gnu / build	1m 2s
x86_64-unknown-linux-gnu-nightly / build	35s
x86_64-unknown-linux-musl / build	1m 6s
x86_64-unknown-netbsd / build	20s
	29m 7s

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