[remote-controlled-man]

is_close() compares iterable inputs with zip(), so it ignores extra elements. As a result, test_close([1], [1, 999]), comparisons against an empty sequence, and nested length mismatches all pass when they should fail.

Use zip_longest() with a unique missing-value sentinel to reject unmatched elements before the recursive comparison. The change is in the owning notebook and its generated Python module. Scalar, string and array comparisons retain their existing paths.

Regression tests cover unequal lengths in both directions, empty and nested sequences, None values and iterators, alongside valid tolerance comparisons. The initial test_close regression fails on unmodified main and passes with this fix.

Validation on macOS / Python 3.12:

• Full nbdev-test --n-workers 2 suite: passed.
• Owning notebook nbdev-test nbs/00_test.ipynb --n-workers 1: passed.
• Native notebook cleaning and export: passed; regenerating leaves the committed notebook, module and index unchanged.
• git diff --check: passed.

Prepared with OpenAI Codex.

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