Test External

`Headers#[]=` handles Array values. #654

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Run time

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Job	Run time
3.2 on ubuntu	2m 32s
3.4 on macos	3m 11s
3.3 on ubuntu	2m 56s
3.4 on ubuntu	2m 36s
3.2 on macos	1m 48s
3.3 on macos	2m 21s
	15m 24s