Why F# evangelism isn't working (2015)

Seriously, you could just use an "out" errno/status. "But then we would have to always check to see if the operation succeeded!": exceptions make people lazy. Just because an exception wasn't thrown, doesn't mean you're doing things correctly.

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Why does a List implement a search algorithm? Why binary search of all things -- because it's convenient? You know if I need a binary search, I can write one myself. Don't pollute my namespace.

        // Searches a section of the list for a given element using a binary search
        // algorithm. Elements of the list are compared to the search value using
        // the given IComparer interface. If comparer is null, elements of
        // the list are compared to the search value using the IComparable
        // interface, which in that case must be implemented by all elements of the
        // list and the given search value. This method assumes that the given
        // section of the list is already sorted; if this is not the case, the
        // result will be incorrect.
        //
        // The method returns the index of the given value in the list. If the
        // list does not contain the given value, the method returns a negative
        // integer. The bitwise complement operator (~) can be applied to a
        // negative result to produce the index of the first element (if any) that
        // is larger than the given search value. This is also the index at which
        // the search value should be inserted into the list in order for the list
        // to remain sorted.
        // 
        // The method uses the Array.BinarySearch method to perform the
        // search.
        // 
        public int BinarySearch(int index, int count, T item, IComparer comparer) {
            if (index () (_items, index, count, item, comparer);
        }

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As far as I can tell, it's unoptimized. It's just plain, OO C# meant to be readable. I don't see any tricks or tweaks to get the IL to be more concise/performant. Maybe the compiler is aggressively optimized for the core lib (but I'm not holding my breath -- because I can't see it).