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Description
In some situations I'd find it very useful to be able to define an array of field names to trigger the expiration, rather than a page selector. So if there was a change to the content of the defined field(s) on any page/template, the cache would expire.
It might be a nice addition to optionally also limit to changes to these fields on specific pages/templates.
Copied over from: ryancramerdesign/ProcessWire#1384