Test README

Add `Structure` property (#483) #1477

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Run time

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Job	Run time
readme (3.8, ubuntu-latest)	55s
readme (3.8, macos-latest)	1m 16s
readme (3.9, ubuntu-latest)	1m 0s
readme (3.9, macos-latest)	1m 39s
readme (3.10, ubuntu-latest)	48s
readme (3.10, macos-latest)	54s
readme (3.11, ubuntu-latest)	47s
readme (3.11, macos-latest)	1m 1s
	8m 20s