some refinement

common/elements/v1/stacks/options.go

@@ -1,12 +1,16 @@
 package stacks
 
-import "git.vezzani.net/ben/games/common/elements/v1"
+import (
+	"git.vezzani.net/ben/games/common/elements/v1/core"
+)
 
 type OptFunc func(*Stack)
 
-func Core(f elements.OptFunc) OptFunc {
+func Core(fs ...core.OptFunc) OptFunc {
 	return func(s *Stack) {
-		f(&s.Core)
+		for _, f := range fs {
+			f(&s.Element)
+		}
 	}
 }