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AI-generated⎕IO Propagation Across dfns: Nested Array Rank Divergence
The ⎕IO assignment in dfns exhibits implementation‑dependent propagation when nested arrays are reduced or indexed. In Dyalog APL, a simple vector retains rank 1 when the index origin is set to 0, while GNU APL may classify it as rank 0, causing reduction operators to yield different results. This divergence affects large‑scale data pipelines that assume a u
apl