When to use undocumented wsdl2java --wrapArrays?

[Jarmo Doc]

I note that Axis 1.3 wsdl2java supports an undocumented option: 
--wrapArrays.  I can see that it causes MyClass [] to be wrapped as 
ArrayOfMyClass.

When would it be sensible to use this option?  I don't see how wrapping an 
array of trivial things in another class serves any useful purpose.

Thanks.

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