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Title: DistMatrix.max() Returns Python int Instead of numpy.int64

Title: DistMatrix.max() Returns Python int Instead of numpy.int64: a task in TaskCompendium spike examples (Harbor dataset). ISSUE Title: DistMatrix.max() Returns Python int Instead of numpy.int64

The task

[ISSUE] **Title:** `DistMatrix.max()` Returns Python `int` Instead of `numpy.int64`

Part of open-athena/taskcompendium-spike.