f readme - a bit more detail in use-after-free note.

Author: TheBlueMatt

lightning-c-bindings/README.md

@@ -57,7 +57,8 @@ passed the void pointer when the object is `Clone`ed in Rust, returning a new vo
 new object. If the `free` pointer is NULL, you will not receive any notification when the trait
 object is no longer needed. If the `clone` pointer is NULL, we assume that the trait object may be
 `memcpy()`'d to create copies. Note that if you release resources with `free` without implementing
-`clone`, you will likely end up with use-after-free bugs.
+`clone`, you will likely end up with use-after-free bugs (as copies of the original this_arg value
+may still exist, unbeknownst to you).
 
 For example, `LDKSocketDescriptor` is mapped as follows:
 ```c