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5 changes: 3 additions & 2 deletions src/awkward/operations/ak_zip_no_broadcast.py
Original file line number Diff line number Diff line change
Expand Up @@ -163,8 +163,9 @@ def _impl(
for layout in layouts:
# get the content of the ListOffsetArray
if not isinstance(layout.content, ak.contents.NumpyArray):
raise ValueError(
"can not (unsafe) zip ListOffsetArrays with non-NumpyArray contents"
raise NotImplementedError(
"ak.zip_no_broadcast cannot (safely) zip ListOffsetArrays with non-NumpyArray contents. "
"This restriction is intentional. Use ak.zip instead for safe zipping."
)
contents.append(layout.content)

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