Pragmatically, typing is for tooling first, catching errors second, soundness a distant third. My tastes run towards a C#-like language (cough Gosu): staticall

Pragmatically, typing is for tooling first, catching errors second, soundness a distant third. My tastes run towards a C#-like language (cough Gosu): statically typed with inference, simple generics (covariance), proper function types to fill in most of the covariant holes, and a dynamic type escape hatch, just in case. But of course they would.