Additionally polish specs to run with --enable-frozen-string-literal
#1578
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| 27s | |
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| 1m 33s | |
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| 1m 22s | |
| 1m 50s | |
| 2m 1s | |
| 2m 8s | |
| 1m 41s | |
| 3m 13s | |
| 4m 5s | |
| 4m 19s | |
| 3m 35s | |
| 1m 31s | |
| 30m 39s |