add simplify jdata docs; fix and check example (#787) #1378

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Job	Run time
build (3.7, 2019.1.13)	2m 11s
build (3.7, 2019.7.30)	2m 19s
build (3.8, 2019.1.13)	2m 2s
build (3.8, 2019.7.30)	2m 20s
	8m 52s