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fix(xlsx): preserve full float precision instead of scientific notation - #2717
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Pass float_format=lambda x: str(x) to DataFrame.to_html() calls in both XLSX and XLS converters so that float values like 123456789.123 are rendered as-is instead of being truncated to 1.234568e+05. Refs: microsoft#2664
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Fixes #2664.
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DataFrame.to_htmldefaults to 6-digit scientific notation, which loses precision for values like123456789.123. This PR passesfloat_format=lambda x: str(x)to bothto_html()calls in the XLSX and XLS converters, preserving the full Python round-trip string representation.XlsxConverterandXlsConverterupdatedtest_float_precision_preserved)