In my workflow I create a task and when I go add a user I see in options
_SPOCacheRead. I wonder what they are for... someone know?
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This is most likely something environment specific.
I would say those are
Portal Super User and
Portal Super Reader accounts as explained here.
To verify my theory you could run following PoweShell script on the server and compare results:
$wa = Get-SPWebApplication -Identity "<WebApplication>" $wa.Properties["portalsuperuseraccount"] $wa.Properties["portalsuperreaderaccount"]