Add AutoInt option #590

Job	Run time
Coverage	23s
Fuzzing Test	1m 23s
Test in i386 (ubuntu-latest, 1.21)	12s
lint	22s
Test in i386 (ubuntu-latest, 1.22)	13s
Test in i386 (ubuntu-latest, 1.23)	21s
page	41s
Test with -race (ubuntu-latest, 1.21)	22s
Test in i386 (windows-latest, 1.21)	2m 6s
ycat	10s
Test with -race (ubuntu-latest, 1.22)	26s
Test in i386 (windows-latest, 1.22)	1m 46s
Test with -race (ubuntu-latest, 1.23)	20s
Test in i386 (windows-latest, 1.23)	1m 21s
Test with -race (macos-latest, 1.21)	22s
Test with -race (macos-latest, 1.22)	19s
Test with -race (macos-latest, 1.23)	26s
Test with -race (windows-latest, 1.21)	3m 35s
Test with -race (windows-latest, 1.22)	2m 18s
Test with -race (windows-latest, 1.23)	3m 26s
	20m 32s

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