> > > Validating default parameters against strict mode seems no worse in kind > (if not degree) than validating parameter lists against duplicates was in > ES5 days. Gross, but doable and I think better than leaving default > expressions non-strict. > > Perhaps you're right. In addition to what we're doing already in ES5 and now ES6 destructuring patterns, I suppose you'd need to recurse into default expressions and look for any bad `delete` expressions, any WithStatements, and any bad BindingIdentifiers. And rinse and repeat with any FormalParameters encountered.
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