// text (first) arg type is number, other args are strings with fractional digits
confirmMid(new NumberEval(123456), new StringEval("3.1"), new StringEval("2.9"), "34");
// startPos is 1x1 area ref, numChars is cell ref
AreaEval aeStart = EvalFactory.createAreaEval("A1:A1", new ValueEval[] { new NumberEval(2), } );
RefEval reNumChars = EvalFactory.createRefEval("B1", new NumberEval(3));
confirmMid(new StringEval("galactic"), aeStart, reNumChars, "ala");
confirmMid(new StringEval("galactic"), new NumberEval(3.1), BlankEval.instance, "");
confirmMid(new StringEval("galactic"), new NumberEval(3), BoolEval.FALSE, "");