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as per https://gist.github.com/erikdehair/efa3005440ca982cca41ebe5347e82d8
Suggest this is added to http://isis.apache.org/guides/ugsec/ugsec.html#_ugsec_hints-and-tips
https://github.com/apache/isis/tree/master/adocs/documentation/src/main/asciidoc/guides/ugsec