Implemented __del__ to clean up hanging coroutines
#532
| Job | Run time |
|---|---|
| 8m 29s | |
| 9m 24s | |
| 11m 10s | |
| 9m 6s | |
| 10m 27s | |
| 10m 41s | |
| 8m 43s | |
| 11m 0s | |
| 10m 29s | |
| 7m 46s | |
| 10m 24s | |
| 9m 46s | |
| 7m 40s | |
| 11m 0s | |
| 10m 24s | |
| 2h 26m 29s |