JET fixes/findings #252

Job	Run time
test (ubuntu-latest, x64, 1.6)	4m 0s
test (ubuntu-latest, x64, 1)	3m 49s
test (ubuntu-latest, x64, 1.10-nightly)	3m 42s
test (ubuntu-latest, x64, nightly)	3m 31s
test (ubuntu-latest, x86, 1.6)	3m 53s
test (ubuntu-latest, x86, 1)	3m 52s
test (ubuntu-latest, x86, 1.10-nightly)	3m 54s
test (ubuntu-latest, x86, nightly)	2m 58s
test (windows-latest, x64, 1.6)	14m 12s
test (windows-latest, x64, 1)	5m 15s
test (windows-latest, x64, 1.10-nightly)	5m 15s
test (windows-latest, x64, nightly)	4m 57s
test (windows-latest, x86, 1.6)	11m 41s
test (windows-latest, x86, 1)	5m 21s
test (windows-latest, x86, 1.10-nightly)	5m 13s
test (windows-latest, x86, nightly)	5m 20s
test (macOS-latest, x64, 1.6)	5m 20s
test (macOS-latest, x64, 1)	5m 17s
test (macOS-latest, x64, 1.10-nightly)	5m 13s
test (macOS-latest, x64, nightly)	4m 39s
	1h 47m 22s

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