Reuse cached pointers when ordering resolution changes

internal/engine/resolution_compare.go

@@ -1,11 +1,6 @@
 package engine
 
-import (
-	"cmp"
-	"slices"
-
-	"go.maximumdirect.net/configkit/internal/document"
-)
+import "go.maximumdirect.net/configkit/internal/document"
 
 // compareResolutionValues reports field-level changes at stable list positions.
 func compareResolutionValues(before, after *document.Node, correspondence ...resolutionCorrespondence) []documentDelta {
@@ -61,11 +56,5 @@ func compareResolutionValues(before, after *document.Node, correspondence ...res
 		}
 	}
 	compare(before, after, Path{})
-	slices.SortFunc(deltas, func(a, b documentDelta) int {
-		if order := cmp.Compare(a.path.String(), b.path.String()); order != 0 {
-			return order
-		}
-		return int(a.kind) - int(b.kind)
-	})
-	return deltas
+	return sortDocumentDeltas(deltas)
 }