procedure eachValue;
overload eachValue(fn, x, ...xs) { fn(x); eachValue(fn, ...xs); }
overload eachValue(fn) { }

procedure mapValues;
overload mapValues(fn, x, ...xs) = ...fn(x), mapValues(fn, ...xs);
overload mapValues(fn) = ;

procedure foldValues;
overload foldValues(fn, x, ...xs) = fn(x, foldValues(fn, ...xs));
overload foldValues(fn, x) = x;

procedure weaveValues;
overload weaveValues(between, x, ...xs) = x, between, ...weaveValues(between, ...xs);
overload weaveValues(between, x, y) = x, between, y;
overload weaveValues(between, x) = x;