Re-interpret 'fusable' to mean with predecessor operations #460
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An operation like 'map_direct' which can read data across block boundaries from its inputs is marked with `fusable=False`, since it cannot be fused with predecessor operations. However, it is permitted for successor operations to fuse with `map_direct`, since they will operate on whole blocks.
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An operation like 'map_direct' which can read data across block boundaries from its inputs is marked with
fusable=False, since it cannot be fused with predecessor operations. However, it is permitted for successor operations to fuse withmap_direct, since they will operate on whole blocks.