Strict mode delete non-configurable is one of the only offenders on the "this really shouldn't be an error" list. The "useful functionality no longer allowed" list is a couple of key things: caller for debug tracing, and `var` in define. The latter was an issue with Narcissus running in V8 --harmony as of recent, though I think it's fixed now. (prohibited with good reason, but providing irreplaceable functionality)
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