Purge specific object, not all variants

[Danila Vershinin]

Hi,

Theoretical question. Supposedly I want to introduce Vary: by device classification: mobile / desktop (via devicedetect etc.)
How would I go around purging just the specific variant of an object,  i.e. purge a page for mobile only?

The documentation here: http://book.varnish-software.com/4.0/chapters/Cache_Invalidation.html <http://book.varnish-software.com/4.0/chapters/Cache_Invalidation.html>
Mentions that all methods will purge all variants.

Is it wrong? Do I correctly understand that forced cache miss is the single method that allows to purge specific variant of an object?
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