Lack of information on maximum dom0 memory size

There is no information in the documentation indicating a maximum or recommended maximum configuration size for dom0. The default for the largest server installation is 4 GB, but it is hinted that 32 GB is possible and a KB article is referenced: http://support.citrix.com/article/CTX134951. Previous versions indicated a maximum recommended value, such as I believe 8 GB for dom0 on XenServer 6.5 (SP1).