assert(!`A`.isCapitalizedSimple);
assert(!`a`.isCapitalizedSimple);
assert(!`alpha`.isCapitalizedSimple);
assert(!`ALPHA`.isCapitalizedSimple);
assert(!`aThing`.isCapitalizedSimple);
assert(`Alpha`.isCapitalizedSimple);
assert(`Jack London`.isCapitalizedSimple);
Check if s starts with a capital letter followed by a lower letter.