github.com/golang/protobuf/proto.extensionResolver.FindExtensionByNumber (method, view implemented interface methods)

one use

	github.com/golang/protobuf/proto (current package)
		extensions.go#L192: func (r extensionResolver) FindExtensionByNumber(message protoreflect.FullName, field protoreflect.FieldNumber) (protoreflect.ExtensionType, error) {