Merge pull request #520 from chewing/optimize-conversion #556

Job	Run time
Coverage preset=rust-coverage	1m 48s
ubuntu-latest, preset=rust-release	1m 24s
Coverage preset=rust-with-sqlite-coverage	1m 56s
ubuntu-latest, preset=rust-with-sqlite-release	1m 28s
Coverage preset=c99-coverage	1m 30s
ubuntu-latest, preset=c99-release	30s
Coverage preset=c99-with-uhash-coverage	1m 20s
ubuntu-latest, preset=c99-with-uhash-release	1m 17s
windows-latest, preset=rust-release	3m 53s
windows-latest, preset=rust-with-sqlite-release	4m 27s
windows-latest, preset=c99-release	2m 10s
windows-latest, preset=c99-with-uhash-release	1m 21s
macos-latest, preset=rust-release	1m 32s
macos-latest, preset=rust-with-sqlite-release	1m 20s
macos-latest, preset=c99-release	28s
macos-latest, preset=c99-with-uhash-release	28s
Final Results	1s
	26m 53s

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