`INIT $RAT-OVERFLOW = CX::Warn` will produce a warning whenever a switch to Num happens. `INIT $RAT-OVERFLOW = Exception` will throw an exception whenever a sw

`INIT $RAT-OVERFLOW = CX::Warn` will produce a warning whenever a switch to Num happens. `INIT $RAT-OVERFLOW = Exception` will throw an exception whenever a switch to Num would happen. If you want to define your own behaviour, you can. For instance: class ZeroOrInf { method UPGRADE-RAT(Int $nu, Int $de) { $nu > $de ?? Inf !! 0 } } INIT $*RAT-OVERFLOW = ZeroOrInf would either convert the value to `Inf`if too large, or to `0` if too small.