Distinguish missing local keys from empty values
Empty buffers are interpreted as Not found. Return explicit presence separate from byte length.
- Focused work estimate
- 1h + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- API design · Data contracts
Estimated field mix
- API design60%
- Storage systems40%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
Fictional desktop cache Pebble needs a small embedded key-value engine. Build against generated keys and bytes using an ordinary filesystem adapter; no production database replacement is implied.
Setup prerequisites
- Create a disposable local fixture directory.
- Implement fault injection for partial writes, sync failure and process restart.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Empty stored value is found
- Absent key is missing
- Deletion yields missing
Implementation constraints
- Avoid truthiness checks on encoded values.
Verification to include
- Read empty value
- Read deleted key
Deliverables
- Read result contract and cases
Rollout and recovery
Revert callers to explicit result checking.
Value of the work
For the engineer: Practice storage formats, durability boundaries and corruption handling.
For the team: Inspect whether an engineer can state and test persistence guarantees.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.