AllowedFilter::exactIn()

[Hesesses]

Would be super handy to have exactIn('param')

for example ...?filter[user_id]=1,2,3,4

QueryBuilder has
AllowedFilter::exactIn('user_id'),

and the rest is magic :)

Of course this can be done with Scope filters or callback, but instead of creating those, the same could be done by adding 2 letters (In)