FA-96490 / Phone number formatting / Member archive

Display masking of subscriber digits: five trailing digits are shown · case 05

One extra digit is revealed.

Member previewVariant 5 · 3 implementations · 7 checks per implementation

Case contract

Strip. A leading "+" and the digits right after it (the country code) are shown. Among the remaining digits only the last four are shown and the others become "*"; separators are kept. If four or fewer digits remain they are all masked.

Why this case matters

Masked numbers appear in receipts, logs and support tools; revealing too much leaks personal data and revealing too little makes verification impossible.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
international with country code kept	`"+42 * 0 1567"`	`"+42 * * 1567"`	Failed

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