Binds this field, i.e.
Binds this field, i.e. constructs a concrete value from submitted data.
the field key
the submitted data
Either a concrete value of type T or a set of error if the binding failed.
Unbinds this field, i.e.
Unbinds this field, i.e. transforms a concrete value to plain data.
the field ke
the value to unbind
either the plain data or a set of errors if unbinding failed
The expected format of
Handles field binding and unbinding.