Currently a strings, needs to become an external ID (a formatter URL exists).
Per community discussion.
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Done:
hoo@terbium:~$ mwscript extensions/Wikibase/repo/maintenance/changePropertyDataType.php --wiki wikidatawiki --new-data-type external-id --property-id P4793 Successfully updated the property data type to external-id.
Also cleaned the hhvm version of the property info cache:
hoo@mwdebug1001:~$ sudo -u www-data php /srv/mediawiki/multiversion/MWScript.php eval.php --wiki wikidatawiki> ObjectCache::getInstance( $wgMainCacheType )->delete( $wgWBRepoSettings['sharedCacheKeyPrefix'] . ':CacheAwarePropertyInfoStore' );