<<.from-version "5.1.20">> The primary purpose of the `variables` operator is to implement the <<.mlink dumpvariables>> or the <<.mlink serach-variables>> macros.
* ''sort'' (default): By default the returned list is alphabetically sorted
* ''raw'': The variable list will be returned as created. The variables "near" the filter run will show up first. So if variables are defined in the tiddler, where the <<.mlink dumpvariables>> or <<.mlink search-variables>> macros are executed, they will be listed first.