fromBase10

assert(!fromBase10!int(null).isValid);
assert(fromBase10!int("0").assumeValid == 0);
assert(fromBase10!int("1").assumeValid == 1);
assert(fromBase10!int("21").assumeValid == 21);
assert(fromBase10!int("321").assumeValid == 321);
assert(!fromBase10!ubyte("256").isValid);
assert(fromBase10!ubyte("255").assumeValid == 255);
assert(!fromBase10!int("yolo").isValid);
assert(!fromBase10!uint("-20").isValid);
assert(fromBase10!int("-231").assumeValid == -231);