Inside a class constructor new.target is the class of the instance under
construction. A compiled new allocates the instance with its concrete class
before the constructor chain runs, and the class hierarchy is closed, so
new.target lowers to a static dispatch over the constructor's class and its
descendants (deepest instanceof first). new.target.name reads the exact
class's name and new.target === C is an exact-class test, without a class
value, so subclasses may construct with other signatures. new.target as a
class value requires every subclass to share the constructor's signature.
Plain functions and function-local subclasses keep explicit refusals.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
