Simplify checked_dims, improving its effects, theoretical runtime, and practical runtime for >=3 dims
#50
| Job | Run time |
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| 58s | |
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| 4m 54s | |
| 5m 26s | |
| 1m 29s | |
| 1m 46s | |
| 1m 56s | |
| 2m 6s | |
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| 1m 56s | |
| 2m 14s | |
| 2m 2s | |
| 2m 9s | |
| 34m 21s |