unexpected dynamic data behavior when loading views

It would appear that data I supply to one view sticks around when I load my second view. This is unexpected. If I supply an array of data when loading a view, I expect that data to dictate which variables are defined when the view gets processed.

For example, I have a controller method:

PHP Code:

    public function somemethod() {
        $foo = array(
            "val1" => "one",
            "val2" => "two",
            "val3" => "three"
        );
        $this->load->view("jtest/scope", $foo);
        
        $bar = array(
            "val1" => "changed one",
            "val2" => "changed two"
        );
        $this->load->view("testview", $bar);
    } 


NOTE that I have loaded the same view twice but have supplied entirely different arrays of data each time. In the second case, I do not define val3 at all.
Here is testview:

PHP Code:

<?php
/**
 * view to test scope when loading views in CI
 */
?>
<div>val1=<?php echo $val1; ?></div>
<div>val2=<?php echo $val2; ?></div>
<div>val3=<?php echo $val3; ?></div> 


The output renders the view twice, as expected, but the second time it's rendered, val3 still has the value that was loaded the first time around. The output:

Code:

val1=one
val2=two
val3=three
val1=changed one
val2=changed two
val3=three

This val3 value is also still around if I use an entirely different view the second time:

PHP Code:

    public function scope() {
        $foo = array(
            "val1" => "one",
            "val2" => "two",
            "val3" => "three"
        );
        $this->load->view("jtest/scope", $foo);
        
        $bar = array(
            "val1" => "changed one",
            "val2" => "changed two"
        );
        $this->load->view("jtest/scope2", $bar);
    } 


It would appear that somehow these vars are cached. This not at all the behavior I would expect and it does not appear to be described in documentation. It may also present a security issue to have any sensitive values cached.

Is there some feature I don't know about that would 'wipe' the data supplied to my view? Seems to me that if you supply data to a view by using an array, then the view should receive that data and nothing more.