optimize: manual destroy

pbuf/buffer_test.go

@@ -53,6 +53,8 @@ func testBuffer(buf *OBuffer, t *testing.T) {
 		}
 	})
 
+	bufcp.ManualDestroy()
+
 	runtime.GC()
 	runtime.Gosched()
 	runtime.GC()

pbuf/bytes.go

@@ -119,3 +119,8 @@ func (b UserBytes[USRDAT]) SliceTo(to int) UserBytes[USRDAT] {
 func (b UserBytes[USRDAT]) Slice(from, to int) UserBytes[USRDAT] {
 	return UserBytes[USRDAT]{buf: b.buf, a: b.a + from, b: b.a + to}
 }
+
+// ManualDestroy please refer to Item.ManualDestroy().
+func (b UserBytes[USRDAT]) ManualDestroy() {
+	b.buf.ManualDestroy()
+}