[android-developers] References to Fragments and memory footprint

Is keeping a reference to fragment that has been removed an anti-
pattern?

If the Fragment is on the backstack it seems like I have observed that
the system can GC fragments and create them later when needed. So if
the Activity keeps a reference to a removed Fragment does it inhibit
that GC?

Trying to understand what the best practice is, and application
designs to avoid (if any).

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