Adam, I tracked this down to a bug in the JSF RI.

Can you open an issue in the JSF RI issue tracker? The problem is that the JSF 
RI assumes that the first element of the value list/array of the UISelectMany 
is the type of the entire list, thus causing the coercion to fail later on. The 
problematic code is 
incom.sun.faces.renderkit.html_basic.MenuRenderer.getCurrentSelectedValues():633
  in JSF 1.2_04-p02. This is clearly a lazy assumption ;)

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