Mechanism-analysis

When a user gesture and a programmatic animation emit completely isomorphic events, and one animation emits multiple events, why a "single-event boolean flag" is doomed to fail — and why the right abstraction is a time window, not a boolean.

How switching the implementation from JS-stack to native-stack turns one import path into a hard error and silently breaks an empty-string trick — and which class of boundary the "resolver guard" and the "UIKit semantics" each belong to.

Why a declarative auth gate and an imperative router.replace inevitably flicker when they coexist — and how one hidden timing fact (derived state flips before the promise resolves) amplifies the double-driver into a visible regression.

React uses reference equality, not value equality, to detect dependency changes — how that low-level semantic turns a harmless empty-array fallback into an infinite setState loop, and why the same code is merely wasteful on the web but fatal on mobile.

Why async/await on this one specific queryFn boundary turns an already-resolved value into undefined on Hermes — and how silent fail-soft disguises it as a harmless feature flag.