Fix unmarshaler with comment #606

Job	Run time
lint	18s
Test in i386 (ubuntu-latest, 1.22)	12s
Fuzzing Test	1m 15s
Test in i386 (windows-latest, 1.21)	1m 44s
Test with -race (ubuntu-latest, 1.23)	30s
Test in i386 (ubuntu-latest, 1.23)	20s
Test with -race (ubuntu-latest, 1.21)	34s
Test with -race (ubuntu-latest, 1.22)	32s
Test in i386 (ubuntu-latest, 1.21)	7s
Test in i386 (windows-latest, 1.23)	1m 44s
Test in i386 (windows-latest, 1.22)	1m 45s
Test with -race (macos-latest, 1.22)	18s
Test with -race (macos-latest, 1.21)	18s
Test with -race (macos-latest, 1.23)	24s
Test with -race (windows-latest, 1.23)	2m 47s
Coverage	26s
Test with -race (windows-latest, 1.22)	1m 52s
Test with -race (windows-latest, 1.21)	2m 9s
page	47s
ycat	6s
	18m 8s

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