Implement DecInt without itoa
#4523
| Job | Run time |
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| 56s | |
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| 6m 22s | |
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| 6m 16s | |
| 5s | |
| 9m 48s | |
| 1m 5s | |
| 1m 15s | |
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| 1m 20s | |
| 1m 5s | |
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| 1m 2s | |
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| 1m 13s | |
| 1m 0s | |
| 1m 2s | |
| 53s | |
| 41s | |
| 1m 0s | |
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| 1m 0s | |
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| 1m 58s | |
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| 2m 7s | |
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| 2m 15s | |
| 28s | |
| 1m 9s | |
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| 49s | |
| 45s | |
| 1h 12m 11s |