FA-96675 / Phone number formatting / Member archive

DID range shorthand expansion: the tail is treated as a whole number · case 05

"5550195-211" expands to "0000211" and is rejected.

Member previewVariant 5 · 3 implementations · 9 checks per implementation

Case contract

Input "START-END" (spaces ignored). END may be a shorter tail that replaces the last digits of START. Both parts must be digits and END no longer than START. The block is START..END inclusive and must hold 1..100 numbers. Return [start, full end, count] or None.

Why this case matters

Number blocks are ordered and ported in shorthand; a wrong expansion provisions numbers that belong to someone else.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
two-digit shorthand	`null`	`["5550100", "5550115", 16]`	Failed

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