I appreciate the intent, but man is this like a minefield waiting to be walked over. Anyone who looks at the code will scratch their head and will not understan

I appreciate the intent, but man is this like a minefield waiting to be walked over. Anyone who looks at the code will scratch their head and will not understand what is going on. An annotation would perhaps make it clearer. That is the generic argument against extension methods wherever they appear. They are very confusing, until you get used to remembering their existence, then you know what to search for. Also, how about IDE support? I would argue it is at least as important as the feature itself. This is mentioned in TFA.