Memory leak by reactive data

[blackkk68]

Repository with reproduction

https://github.com/blackkk68/vue_memory_leak

Problem

Reactive data doesn't remove by garbage collector after component unmount

Snapshot without any actions

Snapshot after component with reactive data mounted (big array in memory)

Snapshot after component with reactive data unmounted and garbage collector launched (array is still in memory)

Snapshot after press button many times (much memory use)

There's no memory leak if using regular array without ref. Is this normal behaviour?