This project is a JavaScript module that detects which kind of boxed primitive an object is, returning the constructor name (e.g., 'Boolean', 'Number', 'String', 'Symbol', 'BigInt') for boxed primitives and `null` for unboxed primitives or `undefined` for non-primitive objects. It's designed for developers working with JavaScript who need reliable type detection across different realms/iframes without relying on `instanceof` or mutable properties.