README: several regions are refinements[0], not bounds

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Claude
2026-10-21 02:02:38 +00:00
co-authored by Claude Opus 5.5
parent ec9b3d721c
commit 18f018befe
+1 -1
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@@ -139,7 +139,7 @@ Scope and limits:
four-cell ghost band. It gives results identical to dense storage and is
infrastructure for future block AMR, not a speedup.
- Several regions: pass a sequence of `(x0, y0, x1, y1)` rectangles as
`bounds`, with both levels blocked (`level_blocks`). Transfers are built once
`refinements[0]`, with both levels blocked (`level_blocks`). Transfers are built once
from their union; adjacent, overlapping and concave unions are accepted when
their actual dependencies close. There is no fixed rectangle-gap rule.
The fine level is then one level-wide grid `(2*ny, 2*nx)`: