better

pkg/actor/grain_pool.go

@@ -2,10 +2,12 @@ package actor
 
 import (
 	"net/http"
+
+	"github.com/gogo/protobuf/proto"
 )
 
 type GrainPool[V any] interface {
-	Apply(id uint64, mutation any) (V, error)
+	Apply(id uint64, mutation proto.Message) (V, error)
 	Get(id uint64) (V, error)
 	OwnerHost(id uint64) (Host, bool)
 	Hostname() string