{"id":"pedagogical-breadth-is-safely-contained","text":"Module isolation safely enables pedagogical breadth: multiple algorithm variants and simplified implementations serve learning goals without production risk, because module boundaries contain the impact of any performance or correctness tradeoff.","truth_value":"IN","source":"","source_url":"","source_hash":"","justifications":[{"type":"SL","antecedents":["multiple-algorithms-serve-pedagogical-breadth","pedagogical-tradeoffs-are-safe-within-module-boundaries"],"outlist":[],"label":"Breadth (multiple variants) and tolerance (brute-force implementations) are both safe because module isolation bounds blast radius"}],"dependents":["module-boundary-is-universal-containment-mechanism","quality-convergence-is-scale-independent"],"metadata":{"last_reviewed":"2026-06-06T06:26:57","review_result":"pass"},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"pedagogical-breadth-is-safely-contained","truth_value":"IN","reason":"SL justification valid","antecedents":["multiple-algorithms-serve-pedagogical-breadth","pedagogical-tradeoffs-are-safe-within-module-boundaries"],"label":"Breadth (multiple variants) and tolerance (brute-force implementations) are both safe because module isolation bounds blast radius"},{"node":"multiple-algorithms-serve-pedagogical-breadth","truth_value":"IN","reason":"SL justification valid","antecedents":["multiple-algorithms-behind-unified-interface","sdi-modules-are-standalone-learning-artifacts"],"label":"Algorithm variety (d1) in standalone learning modules (d1) serves education — the reason these modules offer pluggable algorithms isn't runtime flexibility but showing students multiple valid approaches side by side"},{"node":"multiple-algorithms-behind-unified-interface","truth_value":"IN","reason":"SL justification valid","antecedents":["maps-dual-mode-astar-dijkstra","rate-limiter-four-algorithms","url-shortener-two-strategies"],"label":"Algorithm selection is a configuration choice, not an architectural one — all three systems swap strategies without changing their public contract"},{"node":"maps-dual-mode-astar-dijkstra","truth_value":"IN","reason":"premise"},{"node":"rate-limiter-four-algorithms","truth_value":"IN","reason":"premise"},{"node":"url-shortener-two-strategies","truth_value":"IN","reason":"premise"},{"node":"sdi-modules-are-standalone-learning-artifacts","truth_value":"IN","reason":"SL justification valid","antecedents":["sdi-repo-is-25-independent-modules","sdi-implementations-use-only-stdlib","sdi-implementations-are-in-process-simulations"],"label":"Independence + stdlib-only + simulation compose into zero-dependency pedagogical units"},{"node":"sdi-repo-is-25-independent-modules","truth_value":"IN","reason":"premise"},{"node":"sdi-implementations-use-only-stdlib","truth_value":"IN","reason":"premise"},{"node":"sdi-implementations-are-in-process-simulations","truth_value":"IN","reason":"premise"},{"node":"pedagogical-tradeoffs-are-safe-within-module-boundaries","truth_value":"IN","reason":"SL justification valid","antecedents":["brute-force-acceptable-at-pedagogical-scale","bounded-collections-trade-completeness-for-memory","sdi-modules-are-standalone-learning-artifacts"],"label":"module isolation is the safety boundary for pedagogical simplifications; cross-module reuse means a simplified module becomes a production dependency","outlist":["dmq-reused-by-stock-exchange"]},{"node":"brute-force-acceptable-at-pedagogical-scale","truth_value":"IN","reason":"SL justification valid","antecedents":["geohash-nearby-prefix-scan-is-linear","kv-merkle-tree-brute-force-diff","stock-exchange-price-sort-is-full-resort","news-feed-unfollow-purges-via-linear-scan"],"label":"Consistent choice of simple O(n) over optimal O(log n) across unrelated modules indicates a deliberate pedagogical convention"},{"node":"geohash-nearby-prefix-scan-is-linear","truth_value":"IN","reason":"premise"},{"node":"kv-merkle-tree-brute-force-diff","truth_value":"IN","reason":"premise"},{"node":"stock-exchange-price-sort-is-full-resort","truth_value":"IN","reason":"premise"},{"node":"news-feed-unfollow-purges-via-linear-scan","truth_value":"IN","reason":"premise"},{"node":"bounded-collections-trade-completeness-for-memory","truth_value":"IN","reason":"SL justification valid","antecedents":["news-feed-cache-is-bounded-deque","nearby-friends-history-bounded-100","url-shortener-click-history-bounded","gdrive-version-list-bounded"],"label":"Silent eviction via capped collections is the repo's standard memory-bounding pattern"},{"node":"news-feed-cache-is-bounded-deque","truth_value":"IN","reason":"premise"},{"node":"nearby-friends-history-bounded-100","truth_value":"IN","reason":"premise"},{"node":"url-shortener-click-history-bounded","truth_value":"IN","reason":"premise"},{"node":"gdrive-version-list-bounded","truth_value":"IN","reason":"premise"}]}}