Cannot add an array to a collection using addAll in Velocity

Steps to reproduce:

Execute the following Velocity code in XWiki:

#set ($mySet = $collectiontool.getOrderedSet())
#set ($myString = 'a few words')
#set ($myArray = $stringtool.split($myString, ' '))
#set ($discard = $mySet.addAll($myArray))
$mySet

Expected result:

[a, few, words]

Actual result:

[]

The root cause seems to be that the conversion of the argument fails because during the conversion the type variable isn't resolved.

See XCOMMONS-129 for a workaround how to convert the array to a list first.