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Fullwidth letters occupy one display column · case 05
Fullwidth letters occupy one display column.
Case contract
Sum width 2 for W/F, zero for combining marks, and 1 otherwise; this is a codepoint width model.
Why this case matters
A local executable model for consumers of structured text; oracle values are authored literals, not outputs copied from the repaired implementation.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| boundary 1 | 2 | 4 | Failed |
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