Fix ValueError on separator-only string for grouped int format #160
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| Job | Run time |
|---|---|
| 14s | |
| 33s | |
| 32s | |
| 52s | |
| 55s | |
| 14s | |
| 18s | |
| 23s | |
| 41s | |
| 18s | |
| 48s | |
| 19s | |
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| 24s | |
| 1m 36s | |
| 51s | |
| 45s | |
| 53s | |
| 18s | |
| 15s | |
| 11m 46s |