Don't call rb_str_set_len while released the GVL.
#223
| Job | Run time |
|---|---|
| 7s | |
| 4m 50s | |
| 6m 52s | |
| 5m 32s | |
| 5m 40s | |
| 7m 40s | |
| 5m 36s | |
| 5m 41s | |
| 7m 32s | |
| 5m 22s | |
| 5m 23s | |
| 6m 22s | |
| 5m 19s | |
| 5m 23s | |
| 6m 32s | |
| 5m 22s | |
| 5m 23s | |
| 6m 9s | |
| 5m 17s | |
| 5m 25s | |
| 7m 3s | |
| 5m 18s | |
| 5m 23s | |
| 26s | |
| 22s | |
| 6m 26s | |
| 5m 48s | |
| 2h 22m 13s |