Remove ability to look up values in `this` scope implicitly #291

All 2 960 tests pass, 67 skipped in 7m 50s

1 154 files ±0 1 154 suites ±0 7m 50s ⏱️ ±0s
3 027 tests ±0 2 960 ✅ ±0 67 💤 ±0 0 ❌ ±0
6 114 runs ±0 5 966 ✅ ±0 148 💤 ±0 0 ❌ ±0

Results for commit c4c6754. ± Comparison against earlier commit 750bb4f.