- An arrow function or method on the right of an untyped `instanceof`
has no prototype. Node throws "Function has non-object prototype
'undefined' in instanceof check" for any object, but the runtime threw
only for plain objects, arrays and functions, and answered false for
typed arrays, native handles, promises and typed references. It now
answers false only for primitives.
- Coverage lowers the body of a signature-blocked function for its
diagnostics. A declared `this` parameter now gives that body its
receiver, as lowerFunction does, so `this.label` reports nothing.
Before, each use reported SC1080.
Chris Tate
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