Added package internal/xruntime with helper function AddCleanup

Author: asmyasnikov

internal/xruntime/cleanup.go

@@ -0,0 +1,11 @@
+//go:build !go1.24
+
+package xruntime
+
+import "runtime"
+
+func AddCleanup[T, S any](ptr *T, cleanup func(S), arg S) {
+	runtime.SetFinalizer(ptr, func() {
+		cleanup(arg)
+	})
+}

internal/xruntime/cleanup_go1.24.go

@@ -0,0 +1,9 @@
+//go:build go1.24
+
+package xruntime
+
+import "runtime"
+
+func AddCleanup[T, S any](ptr *T, cleanup func(S), arg S) {
+	runtime.AddCleanup(ptr, cleanup, arg)
+}