use IS_SLASH in various places instead of string comparing
#1913
| Job | Run time |
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| 12s | |
| 34m 55s | |
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| 10m 42s | |
| 42m 15s | |
| 23m 12s | |
| 19m 48s | |
| 13m 24s | |
| 12m 19s | |
| -1s | |
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| -1s | |
| 2h 58m 55s |