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feat: holdout support — normalized models, assignment precedence, exposure fields (ISS-61) - #12

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feat/holdouts

Sep 2, 2026

Commits on Jul 4, 2026
- feat: holdout support — normalized models, assignment precedence, exposure fields, tests
  
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- fix: post-restore review findings
  
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- refactor: simplifier pass for holdouts
  
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Commits on Jul 5, 2026
- style: spotless formatting
  
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Commits on Jul 9, 2026
- fix: address fable-5 review findings
  
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Commits on Jul 10, 2026
- fix: reuse cached forced-variant assignments with custom assignments
  
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- docs: document shared-array immutability invariant
  
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Commits on Jul 12, 2026
- fix: address gpt-5.6-sol review findings
  
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Commits on Jul 13, 2026
- fix: revert VariantAssigner normalizer change to preserve collector hash parity
  
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Commits on Jul 16, 2026
- feat: support full_on holdouts
  
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Commits on Aug 8, 2026
- refactor: revert holdout wire model to first-class experiment shape
  
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Commits on Aug 9, 2026
- feat: enforce holdout suppression and unified holdout exposure emission
  
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- test: rewrite holdout contract tests for the first-class experiment model
  
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- fix: pin holdout cache identity to (id, iteration) to stop exposure thrash
  
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- fix: a suppressed assignment is not a participant in its experiment
  
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- fix: read units_ under contextLock_ and avoid write lock on holdout cache hits
  
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- fix: normalize excludedExperimentIds and preserve holdout triggers on logger failure
  
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- test: prove the holdout union rule and harden malformed/missing-unit edge cases
  
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- refactor: drop redundant suppressed check and rename exposure trigger methods
  
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Commits on Aug 21, 2026
- fix: pin covered-experiment suppression to the same HoldoutAssignment as exposure
  
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- fix: trigger applicable holdouts for every evaluated variable-key candidate
  
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- fix: attach applicable holdouts to overridden assignments
  
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- test: collapse identical variant ternary in holdout experiment factory
  
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Commits on Aug 22, 2026
- fix: resolve holdout definition from live data before pinned-cache checks
  
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- fix: revalidate applicable-holdout coverage on the override fast path
  
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- fix: schedule a publish flush for every enqueued exposure
  
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- fix: sort a defensive copy of excludedExperimentIds instead of the wire object
  
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- feat: replace holdout-side excludedExperimentIds with per-experiment holdoutIds
  
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- test: re-encode holdout fixtures as per-experiment holdoutIds
  
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- test: cover malformed-holdout filtering via explicit refs, drop review-history comments
  
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- refactor: simplify holdout resolution/test machinery
  
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Commits on Aug 28, 2026
- feat: resolve holdout applicability from arm count instead of collector filtering
  
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- test: cover two- and three-arm holdout assignment
  
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- fix: pin holdout arm count with the cached arm so refreshes cannot re-mean it
  
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- refactor: simplify holdout arm resolution
  
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Commits on Aug 31, 2026
- fix: trigger holdout exposures from the assignments used for the decision
  
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- fix: schedule the queued exposure even when the event logger throws
  
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- fix: evict null holdout snapshots on setUnit so a late unit is not lost
  
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- test: close the surviving null-entry eviction mutant on setUnit
  
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- refactor: simplify late-unit invalidation coverage
  
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- docs: keep the degraded-record caveat on the exposed guard
  
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Commits on Sep 1, 2026
- fix: settle exposure state across late-unit retries
  
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- Merge branch 'main' into feat/holdouts
  
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- test: replace stale audience cache signal
  
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- style: fix import order flagged by spotless
  
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Commits on Sep 2, 2026
- fix: narrow custom-assignment cache invalidation to the pinned custom value
  
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- fix: key holdout assignment cache by (id, effective unit type)
  
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- fix: use the bundled Objects shim to hold the Java 1.6 API floor
  
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- test: stop requiring holdoutType in the deserializer fixture
  
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- test: pin both the slim and legacy holdout wire shapes
  
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