Description:
------------
Using settype() to alter FLOATs yields inconsistent values that will sometimes fail comparison operators.

Reproduce code:
---------------
<?php
	// THIS WILL WORK
	$fltOriginal = 3 * .5;
	$fltTransformed = $fltOriginal;

	settype($fltTransformed, 'string');
	settype($fltTransformed, 'float');

	var_dump($fltOriginal);
	var_dump($fltTransformed);
	if ($fltOriginal != $fltTransformed) print ('COMPARISON FAILED -- BUG');

	print ("--------------------------\r\n");


	// THIS WILL **NOT** WORK
	$fltOriginal = 3 * .6;
	$fltTransformed = $fltOriginal;

	settype($fltTransformed, 'string');
	settype($fltTransformed, 'float');

	var_dump($fltOriginal);
	var_dump($fltTransformed);
	if ($fltOriginal != $fltTransformed) print ('COMPARISON FAILED -- BUG');
?>

Expected result:
----------------
float(1.5)
float(1.5)
--------------------------
float(1.8)
float(1.8)

Actual result:
--------------
float(1.5)
float(1.5)
--------------------------
float(1.8)
float(1.8)
COMPARISON FAILED -- BUG