| Value | Meaning |
|---|---|
| Success | The merge was performed successfully. |
| WereAlreadyEqual | Both objects are already equivalent, so nothing was done. |
| IdClash | ERROR: Both objects were erroneously given the same id, so nothing was done. |
| Incompatible | ERROR: The objects are not able to be merged (eg. not the same width), so nothing was done. |
Possibilities for the result of a merge operation.