"acts as an invaluable pair-programming buddy that gives instantaneous feedback during development." This is the key bit, this is called static analysis, you d

"acts as an invaluable pair-programming buddy that gives instantaneous feedback during development." This is the key bit, this is called static analysis, you don't need a type system in your language to do this, and you don't need to force doing it at compile time Most developers appear to conflate the two, uncoupling static analysis and type systems would benefit most workflows