FA-11385 / Spreadsheet calculation semantics / Member archive

Percent formatting changes the stored numeric value · case 05

Applying percentage formatting multiplies the stored cell value.

Member previewVariant 5 · 3 implementations · 6 checks per implementation

Case contract

For a finite float input whose binary floating-point product value*100 is also finite, and decimal places 0..3, return [unchanged stored value, fixed-point display of that product with percent suffix]. This is a formatting-only operation using Python float formatting, not exact decimal arithmetic.

Why this case matters

This isolated spreadsheet model makes cell semantics explicit; it does not claim compatibility with every workbook engine.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
fraction stored unchanged	`[62.5, "62.5%"]`	`[0.625, "62.5%"]`	Failed

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