I have a sibling comment -- having thought about this for a very very long time, zig should really implement binary pseudo-operator syntactic sugar. I don't think this violate zig's spirit of 'no hidden function calls' in that I don't think it takes much of a mental lift to "get" that (_ <+> _) means "heyo this is a function call, not a true operator".
At first I was going to say that I disagreed since you couldn't choose what implementation of addition you wanted, but now that I've read your comment where you import the type of addition used, it's growing on me. Would you have operator precedence, or would it be more like Smalltalk's binary operators?
forced use of parens, or else syntax error.