form_multiselect() with name of channel_templates['. $k .'][] not posting an array

[eluser]litzinger[/eluser]
As the title says, I'm using the form_multiselect() option to print a series of multi-selects in an ExpressionEngine extension. I'm looping over an array, so each name is printed as such:

Code:

name="channel_templates[0][]"
name="channel_templates[1][]"
name="channel_templates[2][]"

These are not posting as arrays, what am I doing wrong?

Thanks