FA-66735 / Airline fare rule evaluation / Member archive

Any letter after the RBD taken as a season · case 05

KW3NR decodes season W and loses the weekend day code.

Member previewVariant 5 · 3 implementations · 12 checks per implementation

Case contract

Input: a fare basis string. Grammar: RBD letter A-Z (ASCII uppercase, else 'ERR_BASIS'), optional season H|L, optional day code W (WEEKEND) | X (WEEKDAY), optional advance purchase digits of any length (default 0), then two-letter tokens from CH, IN, NR (otherwise or odd length -> 'ERR_TOKEN'). Return {'rbd','season','days','ap','flags'}.

Why this case matters

Fare basis codes pack booking class, season, day-of-week application, advance purchase and passenger/penalty indicators into a positional code.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
weekend without season	`{"ap": 7, "days": "ANY", "flags": ["NR"], "rbd": "K", "season": "W"}`	`{"ap": 7, "days": "WEEKEND", "flags": ["NR"], "rbd": "K", "season": null}`	Failed

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