Allow transitive properties in @fields in REST API These transitive properties may not cross Multilinks, e.g., when querying 'issue' the property 'messages.author' is not allowed (because 'messages' is a multilink). A multilink at the end (e.g. messages in the example) is fine.

def audit_html_files(db, cl, nodeid, newvalues):
    if 'type' in newvalues and newvalues['type'] == 'text/html':
        newvalues['type'] = 'text/plain'
    

def init(db):
    db.file.audit('set', audit_html_files)
    db.file.audit('create', audit_html_files)