Add support for CHIPS 'partitioned' attribute. #96

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Run time

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Job	Run time
Check MSRV	3m 9s
Linux (stable)	2m 15s
Linux (beta)	1m 52s
Linux (nightly)	1m 52s
Windows (stable)	4m 2s
Windows (beta)	2m 57s
Windows (nightly)	2m 43s
	18m 50s