WebXML reorders default filters, this breaks UTF-8 POST requests

In default web.xml there is charEncodingFilter filter-mapping on the first place. WebXML config places it after hiddenHttpMethod filter. HiddenHttpMethod filter uses getParameter() method before request.setEncoding() method was called. This causes all UTF-8 characters in request parameters are incorrectly handled.
I suppose that this behavior is caused by findFilterMappingNames method in _Events.groovy script (in scripts directory). This method uses Set instead of List, to store filter-mappings.