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mask_query.flag_positions treats every negative map value as off-coverage

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#914 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
75/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
python
Domain
data

Research direction

Start at shapepipe.utilities.mask_query.flag_positions and inspect how the map exposes its off-coverage sentinel. Verify the logic distinguishes that sentinel from other negative values, then run the relevant existing tests and add coverage for a legitimate negative map value; done means only off-coverage is treated as clean.

Written by the indexing model from the issue text.

Description

shapepipe.utilities.mask_query.flag_positions zeroes every negative integer map value, not only healsparse's off-coverage sentinel, so a map that legitimately carried negative values would read as clean. Correct today (UNIONS maps carry non-negative bits), but the contract off-coverage-is-clean holds only by that accident; compare against the map's sentinel explicitly. Found while writing that contract (#875).

Dominant language
Python
Stars
18
Forks
14
Avg merge
1d 4h
Merged PRs (30d)
18

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