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Route loader ownership: Retained data on error · case 04

Retained data on error.

Member previewVariant 4 · 3 implementations · 60 checks per implementation

Case contract

A mounted route owns only its current route key and request generation. Empty mappings are successful data; null is no data; even an empty error string is an error. Old requests cannot settle current loading. Operation retained-data-on-error has the six explicit input/output oracles below.

Why this case matters

An offline client lifecycle model that isolates a state-management defect without DOM rendering or network services.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
retained-data-on-error scenario 2	`{}`	`{"old": 4}`	Failed

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