修复bindValue绑定长整型参数失精度，导致where无法正确匹配数据问题！！！该问题影响了thinkphp目前全部版本 #505
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修复php转换浮点数导致的精度问题，如 ```php <?php $a = '99999999999999'; echo (float)$a; // 99999999999999 $b = '999999999999999'; echo (float)$b; // 999999999999991.0E+15 ``` 而self::PARAM_FLOAT = 18已经超过了php的15位的长度了，会导致无法where匹配不上长整型的数据
slongzhang
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修复php转换浮点数导致的精度问题，如
而self::PARAM_FLOAT = 18已经超过了php的15位的长度了，会导致无法where匹配不上长整型的数据
该问题影响了thinkphp目前全部版本