Fix assert frame equal na 61473#62551

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LandonB5 wants to merge 2 commits intopandas-dev:mainfrom

LandonB5:fix-assert-frame-equal-na-61473

Commits on Oct 2, 2025

BUG: treat missing sentinels as equal across dtypes when check_dtype=False; add test (GH#61473)
LandonB5
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BUG: normalize pd.NA and np.nan when check_dtype=False (GH#61473)
LandonB5
committed