BUG: ensure to_numeric down-casts to uint64 for large unsigned integers #61766
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mroeschke
reviewed
Jul 3, 2025
| # parsing large Python ints), attempt a direct cast to uint64 as a | ||
| # last resort. This addresses GH#14422 where `to_numeric` failed to | ||
| # downcast `[0, 9223372036854775808]` to ``uint64``. | ||
| if ( |
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Could you investigate why this isn't being done in maybe_downcast_numeric instead?
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to_numeric(..., downcast="unsigned") failed to honour the requested
uint64 dtype when values exceeded
np.iinfo(np.int64).max, returningfloat64instead and losing integer precision (GH #14422 /test_downcast_uint64).
Added a fallback that detects integral, non-negative float results and
safely casts them to
np.uint64. All existing logic remains unchangedfor other code paths; the previously xfailed test now passes.