Doctrine Integer Validator should use intval() rather than round(floatval())

echo PHP_INT_MAX;
echo "\n";
echo strval(round(floatval(PHP_INT_MAX)));

on 64 bit machine, default php install, you get:

9223372036854775807
9.22337203685E+18

float precision is set to 12 by default. setting it higher offers no benefit, with it set to 20+, it still doesn't match up (and is actually not reliably past a certain length, i'd have to dig again to find a reference though), but as you can see, no go:

9223372036854775807
9223372036854775808

as a result, very large #'s do NOT validate as doctrine integers, even though they are.

fix, use intval() instead. as far as I can tell, and as far as our 400+ unit tests in our application show, PHP_INT_MAX is fully supported everywhere else except for in Validator.php@170:

170c170
<                  return (string) $var == strval(round(floatval($var)));
---
>                  return (string) $var == strval(intval($var));