FA-45592 / Data systems / Member archive

Default dependency cycles silently return a partial row · case 02

Default dependency cycles silently return a partial row.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Materialize missing columns using ordered default rules [target,source-or-None,constant]. A constant rule writes constant; a dependent rule writes source+constant, propagating explicit null. Existing columns including None and zero never change. Resolve forward dependencies to a fixed point; unresolved dependencies return DEFAULT_CYCLE.

Why this case matters

A bounded deterministic data engine model makes representation and changelog faults reproducible.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
dependency cycle	`{}`	`"DEFAULT_CYCLE"`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.