Reductions can handle padding in the first dimension now

Author: FrancescAlted

src/blosc2/lazyexpr.py

@@ -2006,7 +2006,7 @@ def reduce_slices(  # noqa: C901
     # Only behaved partitions are supported in miniexpr reductions
     if use_miniexpr:
         # Avoid padding issues except for 1D arrays (contiguous along the only axis).
-        if len(shape) != 1 and builtins.any(s % c != 0 for s, c in zip(shape, chunks, strict=True)):
+        if len(shape) != 1 and builtins.any(s % c != 0 for s, c in zip(shape[1:], chunks[1:], strict=True)):
             use_miniexpr = False
         if use_miniexpr and isinstance(expression, str):
             has_complex = any(