Description:
------------
Using bcmod on float return incorrect value


Test script:
---------------
<?php

$leftOperand = '0.00000000099999';
$modulus = '-0.00056';
$scale =14;

// incorrect :
echo bcmod($leftOperand,$modulus, $scale);

// this how it should work 
// mod(a, b) = a - b * floor(a/b)
/*
echo bcsub(
            $leftOperand,
            bcmul(
                $modulus,
                floor(bcdiv($leftOperand, $modulus, $scale)),
                $scale
            ),
            $scale
        );
*/    

Expected result:
----------------
-0.00055999900001


Actual result:
--------------
0.00000000099999