❔ Prevent accepting numeric values as enum

Hello, I have an API that exposes an enum field Vehicle (Car, Bike, Truck) in the POST. The problem is that when I POST a request with a body

{"vehicle" :"1" }

{"vehicle" :"1" }

, it gets accepted and gets automatically converted to Vehicle.Bike.. But something like

{"vehicle" :"bar" }

{"vehicle" :"bar" }

results in a bad request, which is what I need !
Any idea on how to stop parsing integer like enum values?