Floater does not always go away in controlled mode

[deevus]

🐛 Bug Report

If you thrash the state of the floater in controlled mode, it sometimes does not go away even though open={false}

To Reproduce

Quickly move your mouse over the "Hover Me" button. You should eventually get a floater with the text "I should not be open"

Expected behavior

The floater should disappear when open={false} in controlled mode

Link to repl or repo (highly encouraged)

https://codesandbox.io/s/pwwppv1060?fontsize=14

Run npx envinfo --system --binaries --npmPackages react-floater

Paste the results here:

npx: installed 1 in 1.991s

  System:
    OS: Linux 5.0 Fedora 29 (Workstation Edition) 29 (Workstation Edition)
    CPU: (8) x64 Intel(R) Core(TM) i7-7820HQ CPU @ 2.90GHz
    Memory: 4.92 GB / 31.15 GB
    Container: Yes
    Shell: 4.4.23 - /bin/bash
  Binaries:
    Node: 10.15.3 - ~/.nvm/versions/node/v10.15.3/bin/node
    Yarn: 1.13.0 - /home/linuxbrew/.linuxbrew/bin/yarn
    npm: 6.8.0 - ~/Projects/vimily/bonjoro/node_modules/.bin/npm
  npmPackages:
    react-floater: ^0.6.4 => 0.6.4 

[deevus]