How strict is Southwind about carry-on bags that are slightly oversized but can fit in the baggage sizer?

A Southwind passenger reported no problems with her small carry-on and did not see any carry-on baggage disputes involving other passengers.

Asked about a soft bag exceeding the size limit by 2 cm, the passenger thought it would be accepted if it could be squeezed into the baggage sizer. This was her assessment, not a report of having that oversized bag checked on her own flight.