A deep-dive tutorial rebuilding React 16's Fiber architecture from scratch as a learning exercise called 'Didact'. Covers the fiber data structure (parent/child/sibling/alternate properties), incremental reconciliation using requestIdleCallback for scheduling, the work-in-progress tree concept, effect tags (PLACEMENT, UPDATE, DELETION), and the commit phase for DOM mutations. Explains why recursive reconciliation was replaced with a loop-based approach to allow pausing and resuming work without blocking the main thread.
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