test several possible changes of the Holland 2010 implementation #107

All 647 tests pass in 6m 39s

647 tests ±0 647 ✔️ ±0 6m 39s ⏱️ - 3m 59s
    1 suites ±0     0 💤 ±0
    1 files ±0     0 ❌ ±0

Results for commit a335742. ± Comparison against earlier commit 8c8ee96.