$form->input interpreting 0 as unset in first parameter

This has me beat. I'm trying to create an array of fields in cakePHP
1.3 & PHP 5.3.2
The array is zero based. On the first iteration, $count == 0. For some
reason the string concatenation seems to convert this to null or unset
which cake then interprets as "insert controller name here", viz:

for($count=0;$count<$num;$count++)
{
echo $form->input($count.'.NodeDescriptor.title');
}

OUTPUTS (cleaned of fluff for clarity):

<input name="data[NodeDescriptor][NodeDescriptor][title]" type="text"
id="NodeDescriptorNodeDescriptorTitle" />
<input name="data[1][NodeDescriptor][title]" type="text"
id="1NodeDescriptorTitle" />
...

I've tried casting the value, strval'ing it, single quotes, double
quotes, double quotes and {} to no avail. Is this a PHP feature, a
CakePHP unrobustness or me being dumb?

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