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How is it a strict subset when they already added Math.imul and now Math.fround?

Math.imul and Math.fround are in the ES6 draft, which has consensus and cross-vendor support: https://people.mozilla.org/~jorendorff/es6-draft.html

As in, not in IE 11?

I see no indications that IE will not implement ES6, as they're on the committee and participating.

Those are libraries?