Truncate tweaks #616

Job	Run time
loom	1m 36s
minrust	1m 27s
cross (i686-unknown-linux-gnu)	35s
cross (armv7-unknown-linux-gnueabihf)	38s
miri	10m 29s
nightly	2m 39s
cross (powerpc-unknown-linux-gnu)	38s
rustfmt	14s
cross (powerpc64-unknown-linux-gnu)	37s
stable (ubuntu-latest)	1m 15s
cross (wasm32-unknown-unknown)	12s
tsan	1m 52s
stable (macos-latest)	3m 21s
stable (windows-latest)	2m 22s
Publish Documentation	1m 19s
	29m 14s

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