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fix: preserve replacement cache entries after batch failure - #404
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Fixes #403.
If a key is cleared and reloaded or primed while an earlier batch is pending, that batch's failure currently evicts the replacement entry. Track each queued request's promise and only clear the cache when it still contains that promise. The original rejection, normal failed-request eviction, and per-item error caching are preserved.
Adds 17 deterministic regression/control cases for pending, completed and primed replacements, normalized keys, custom cache maps, batching on/off, repeated keys across batches, disabled caching and synchronous batch exceptions. Against the original source, 14 fail and 3 pass; with this fix, the full 76-test suite passes on Node 18, 20 and 22.
npm run test:ci -- --runInBandpasses on Node 22 (lint, Flow, and 100% statement/branch/function/line coverage), as do the build and a built-output reproduction.Includes a patch changeset. This changes observable cache behavior after failure; happy to adjust the release classification if needed. Related Python-port fix: syrusakbary/aiodataloader#60.