Seeking heuristic tweaks #1150

Job	Run time
cross (armv5te-unknown-linux-gnueabi)	46s
lint	22s
msrv	19s
test (windows-latest, stable, --all-features)	4m 3s
test (ubuntu-latest, stable)	29s
test (ubuntu-latest, stable, --no-default-features)	33s
test (macos-latest, stable, --all-features)	55s
test (ubuntu-latest, stable, --all-features, --target armv5te-unknown-linux-gnueabi, true)	28s
test (ubuntu-latest, stable, --all-features)	27s
test (ubuntu-latest, beta, --all-features)	29s
audit	21s
	9m 12s

Provide feedback