The customData a CmcdReporter method accepts, for a reporter typed
C.
A reporter with the default C constrains nothing, so requests with any
customData are accepted exactly as before C existed. A reporter with a
concrete C requires the request to satisfy it. The reporter's transforms
read customData as C and would otherwise receive a value their type
does not describe.
The
customDataa CmcdReporter method accepts, for a reporter typedC.A reporter with the default
Cconstrains nothing, so requests with anycustomDataare accepted exactly as beforeCexisted. A reporter with a concreteCrequires the request to satisfy it. The reporter's transforms readcustomDataasCand would otherwise receive a value their type does not describe.