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'root' user changierchanged to 'dovenull' after disabling SIP

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El-Capitan upgrade changed 'root' user changier to 'dove null' user globally?'dovenull' after disabling SIP

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El-Capitan upgrade changed 'root' user to 'dove null' user globally?

I upgraded Yosemite 10.10.5 to El-Capitan over the last 2 days, and also disabled SIP. .. and because I do a lot of building of my own things like postfix and dovecot, I didn't notice until today that I no longer have a root user, and where 'root' should appear, it's ownership is now 'dovenull' - a user name related to dovecot. I wonder what happened to 'root' ?

drwxrwxr-x+ 152 dovenull  admin    5168  6 Oct 12:32 Applications
drwxr-xr-x+  64 dovenull  wheel    2176  5 Oct 21:59 Library
drwxr-xr-x@   2 dovenull  wheel      68  5 Oct 21:51 Network
drwxr-xr-x@   3 robert    staff     102  8 Sep 21:18 Read Before You Install iTunes.app
drwxr-xr-x@   4 dovenull  wheel     136  5 Oct 21:45 System
lrwxr-xr-x    1 dovenull  wheel      49 21 Feb  2015 User Information -> /Library/Documentation/User Information.localized
drwxr-xr-x   15 dovenull  admin     510  5 Oct 21:51 Users
drwxrwxrwt@   7 dovenull  admin     238  6 Oct 14:31 Volumes

Everything appears to work fine, including the mailserver and apps. Should I worry about this?