jsonBindingParam-converter interfering with "normal" @BindingParams

running the attached example shows 3 cases where the jsonBindingParam affects normal @BindingParam-annotated command arguments

e.g.
an empty list results in a new ArrayList
an ArrayList containing the value "\"Peter\"", gets transformed into a new list containing "Peter"
a Pojo whose toString method produces a string starting with "null ..." is results in a null reference instead of the original Pojo