SIE.6:8 - Common Anti-Patterns and How to Avoid Them

Anti-pattern	Repair
Last write wins	State why time establishes supersession for this claim and interval; otherwise retain both.
Trusted source always wins	Name the source’s exact authority scope and preserve losing claims and conflict.
Average the values	Establish compatible meaning, subject, unit, interval, and aggregation semantics first.
Null means zero or absent	Preserve missing, unavailable, unknown, not applicable, and zero as distinct branches.
Provenance after fusion	Keep source claims and derivation as inputs to the composition, not decoration on the result.
One canonical fact	Return a qualified view only when the use and authority rule warrant it; otherwise return plural claims or conflict.