More than 9 instances of a multiple field fails within the Experience Manager

Fields in document type definitions with the 'multiple' and 'ordered' attributes are restricted to a maximum number of 9 repetitions.

Class 'org.onehippo.cms.channelmanager.content.document.util.FieldPath'  RegEx

private static final Pattern NUMBERED_SUFFIX = Pattern.compile("^\\[\\d\\]$");
 

supports only one digit. 
(NOTE: in document editor, there is no such a limit)