Compacted cell sets

Hierarchy

H3 compact() collapses a full set of same-resolution children into their common parent wherever complete; consumers unaware of compaction assume single-resolution set operations.

Detection

Resolutions vary across the set and no explicit compaction flag/marker is attached.

Mitigation

Tag delivered sets as compact vs. uniform explicitly
uncompact() to a target resolution before any comparison, union, or platform delivery that assumes uniform resolution

Affected conversions

Cell systemcell system
H3platform-native IDs