Why is the 'sss' backend verboten as a default IDMAP backend?

[Alexander Bokovoy]

On pe, 14 heinä 2017, Richard Sharpe via samba-technical wrote:
> Hi folks,
> 
> Just testing 4.7rc3 and ran into this problem:
> 
> ERROR: Do not use the 'sss' backend as the default idmap backend!
> 
> Why is that?
Because default idmap backend needs to be writable while 'sss' is a
read-only backend.

-- 
/ Alexander Bokovoy