Object memory leak with keepalive

[ChuckFields]

Version

2.6.10

Reproduction link

(removed)

Steps to reproduce

Clicking on the about tab will create a javascript object with the class LingeringObject and put it in the store under lingeringObj.
Clicking on the home tab destroys the about component and resets lingeringObj to null.
If you now click the collect garbage button take a heap snapshot with chrome, then type LingeringObject in the Class filter, you'll see the object that was just created, however there are no references to it. If I remove the keepalive, this is no longer an issue. The keepalive has exclude="about" on it.

What is expected?

The LingeringObject to get garbage collected

What is actually happening?

Somehow Vue is holding onto a reference of the LingeringObject

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Here is the source code to the reproduction link: https://github.com/ChuckFields/LingeringObject

[ChuckFields]

This may be related to this PR: #9962

[posva]

#9962 should fix this.
Note: When reporting memory leaks, please provide boiled down repros (no store no router)