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Malte UblandClaude Opus 5.5
1144e3cea4
fast-deep-equal and every isPlainObject idiom compare `o.constructor ===
Object` and `o.valueOf === Object.prototype.valueOf`. Natively a dynamic
read of an inherited Object.prototype member answered undefined and the
JavaScript identifier `Object` was a string identity token, so
equal({a: 1}, {a: 1}) was false with no diagnostic.
The builtin constructors Object, Function, Date, RegExp, Map, Set,
Promise, WeakMap and WeakSet now read as interned function values (in
TypeScript too, where they were refused), and dynamic values answer
`.constructor` with the same functions: plain objects (including
Object.create chains), arrays, functions, class instances and the native
Date/RegExp/Map/Set/WeakMap/WeakSet/Promise values. A member no nearer
prototype defines falls back to the interned Object.prototype method
`Object.prototype.<name>` reads (valueOf, toString, hasOwnProperty,
propertyIsEnumerable), respecting the types that define their own
toString or valueOf. Typed records and class instances read these
members through their dynamic view instead of hitting the stdlib fence.
`instanceof` accepts the constructors, and `Object(v)` / `new Object()`
work through a stored value; calling the other constructors through one
stays fenced.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>