About [[MediaWiki:Apihelp-query+categorymembers-paramvalue-prop-type/en]]

No, those are the literal values that will be returned. The English message should be Adds the type that the page has been categorised as (<samp>page</samp>, <samp>subcat</samp> or <samp>file</samp>).

Anomie00:35, 24 January 2016