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Dataset deduplication: formatting whitespace creates duplicate records · case 05
formatting whitespace creates duplicate records.
Case contract
Return distinct keys after collapsing each whitespace run to one space and trimming ends; case is preserved.
Why this case matters
This deterministic toy operation makes one dataset equivalence or representative rule explicit.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| tabs and spaces | 2 | 1 | Failed |
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