Please move to appropriate thread if there is one as I couldn’t find one.

Without debating the “pet in cabin” not cargo topic as that is NOT my question or concern….
is the 8” or 20cm height restriction a hard restriction or will a 9-10” or 22-25cm fit ?
Im not trying to circumvent a regulation it’s just that nearly all other airlines have closer to —10” and soft carriers that are a bit bigger than 8” are way more readily available
if it’s relevant, will be in Rouge premium A319-100
And yes I know it has to be pre booked
it’s the size (height) even though the size is on the website I was hoping for personal experience with
many thanks