Fix bug with too-long substrings (#350) #101

All 294 tests pass, 22 skipped in 6m 8s

    2 files ±0   21 suites +1 6m 8s ⏱️ +25s
316 tests +3 294 ✔️ +1 22 💤 +2 0 ❌ ±0
319 runs +3 297 ✔️ +1 22 💤 +2 0 ❌ ±0

Results for commit f4bdb42. ± Comparison against earlier commit 025f6b6.