Merge 'v1.6.1' into 'master' (#721) #688

Job	Run time
loom	1m 54s
miri	11m 13s
cross (i686-unknown-linux-gnu)	28s
minrust	1m 57s
cross (armv7-unknown-linux-gnueabihf)	35s
nightly	2m 56s
cross (powerpc-unknown-linux-gnu)	51s
rustfmt	4s
cross (powerpc64-unknown-linux-gnu)	29s
stable (ubuntu-latest)	1m 18s
cross (wasm32-unknown-unknown)	20s
stable (macos-latest)	1m 12s
tsan	2m 24s
stable (windows-latest)	2m 19s
Publish Documentation	1m 49s
	29m 49s

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