Implement DecInt without itoa
#4527
| Job | Run time |
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| 25s | |
| 54s | |
| 4m 42s | |
| 6m 7s | |
| 5m 58s | |
| 8s | |
| 10m 10s | |
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| 1m 1s | |
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| 1m 6s | |
| 51s | |
| 1m 0s | |
| 55s | |
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| 1m 6s | |
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| 1m 3s | |
| 1m 0s | |
| 40s | |
| 53s | |
| 1m 8s | |
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| 1m 14s | |
| 1m 1s | |
| 1m 57s | |
| 2m 11s | |
| 2m 14s | |
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| 2m 5s | |
| 2m 13s | |
| 2m 18s | |
| 30s | |
| 44s | |
| 42s | |
| 46s | |
| 55s | |
| 1h 9m 46s |