Merge pull request #342 from yongqli/master #560

Job	Run time
documentation	1m 11s
clippy	1m 4s
benchmarks	1m 43s
rustfmt	11s
test (msrv, ubuntu-20.04, 1.64.0)	2m 25s
Miri	1m 53s
test (stable, ubuntu-20.04, stable)	1m 33s
Optional features (approx selected)	37s
test (beta, ubuntu-20.04, beta)	1m 2s
Optional features (none selected)	42s
test (nightly, ubuntu-20.04, nightly)	1m 6s
static SuiteSparse (stable, ubuntu-20.04, stable)	42s
test (macos, macos-latest, stable)	2m 10s
static SuiteSparse (macos, macos-latest, stable)	1m 25s
test (win-msvc, windows-2019, stable)	1m 53s
static SuiteSparse (win-msvc, windows-2019, stable)	1m 25s
test (win-gnu, windows-2019, stable)	1m 52s
static SuiteSparse (win-gnu, windows-2019, stable)	1m 27s
	24m 21s

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