Remove unnecessary constraint from filterIsInstance(Class<R>) signature #KT-6516 Fixed
toSortedMap() without comparator requires non-null keys #KT-6509 Fixed
Fix Array<out> variance in stdlib #KT-6482 Fixed
Take into account collection sizes when possible #KT-6180
Implement Collection<T>.size() on map's values() in JS
JS stdlib: fixed Set::equals.
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