If it were up to me: make sure it has the primitives required to write things in a "mostly functional" way if the programmer desires/when the problem fits the s

If it were up to me: make sure it has the primitives required to write things in a "mostly functional" way if the programmer desires/when the problem fits the space. Not sure the whole list but maybe starting with nice syntax for lambdas and built in immutable collections? Maybe a macro system for introducing syntax? OK you caught me just make it a lisp with python syntax and types.