Return a copy of size bytes from this starting from offset.
This copy is guaranteed to be writable. size can be set to -1 to return a copy from offset to the end of the
memory region.
| this |
a Memory |
| offset |
offset to copy from |
| size |
size to copy, or -1 to copy to the end of the memory region |
|
a new copy of this if the copy succeeded, null otherwise. |