| ------- Copy 17 bytes from BUFFER to TARGET |
| before: buffer = |0123456789abcdefXXXXX| |
| before: target = |---------------------| |
| after: buffer = |0123456789abcdefXXXXX| |
| after: target = |0123456789abcdefX----| |
| |
| ------- Destructive overlap #1 |
| before: |012345678901234567890| |
| after: |000000000000000000890| |
| ------- Destructive overlap #2 |
| before: target = |---------------------| |
| after: target = |-xxx-----------------| |
| ------- Destructive overlap #3 (max length) |
| |
| ------- Non-destructive overlap buf[0:4] = buf[10:14] |
| before: buf = |0123456789abcde| |
| after: buf = |abcde56789abcde| |
