utils: redocument +refix horrible value bug discovered in remap[T]/5
#369
| Job | Run time |
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| 28s | |
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| 4m 45s | |
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| 3m 35s | |
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| 4m 23s | |
| 4m 55s | |
| 4m 35s | |
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| 4m 7s | |
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| 4m 51s | |
| 1h 23m 11s |