FA-96622 / Phone number formatting / Member archive

SMS sender identifier classifier: bare long numbers stay without a plus · case 02

"425550111" is returned without its leading plus.

Member previewVariant 2 · 3 implementations · 14 checks per implementation

Case contract

Strip. "+" followed by 8..15 digits is a long code (else invalid). All digits: 3..6 is a short code, 8..15 is a long code rendered with a leading "+", anything else invalid. Otherwise 1..11 characters of letters, digits, space, hyphen or dot with at least one letter is an alphanumeric sender. Return [kind, value].

Why this case matters

Sender identifiers are normalized before messages are queued; a misclassified sender is rejected by the carrier or impersonates another sender.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
bare long number gains a plus	`["longcode", "425550122"]`	`["longcode", "+425550122"]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.