Implement DecInt without itoa
#4525
| Job | Run time |
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| 55s | |
| 4m 51s | |
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| 6m 16s | |
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| 9m 46s | |
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| 1m 4s | |
| 1m 13s | |
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| 1m 6s | |
| 1m 1s | |
| 1m 8s | |
| 51s | |
| 1m 2s | |
| 37s | |
| 53s | |
| 1m 3s | |
| 1m 6s | |
| 1m 7s | |
| 1m 16s | |
| 1m 12s | |
| 1m 56s | |
| 2m 39s | |
| 2m 28s | |
| 2m 10s | |
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| 2m 9s | |
| 2m 15s | |
| 28s | |
| 1m 13s | |
| 56s | |
| 50s | |
| 36s | |
| 1h 11m 52s |