[niftich]

An update over the course of the previous 19 hours [1][2]; apparently that foreseeable future ended 10 hours after you posted this excellent reminder. They have begun closing [3] all outstanding github issues for v3 with the text:

  Bootstrap 3 is no longer being officially developed
  or supported.

  All work has moved onto our next major release, v4.
  As such, this issue or pull request is being closed
  as a "won't fix." For additional help and support,
  we recommend utilizing our community resources.
  Thanks for your understanding, and see you on the
  other side of v4!

  <3,
  @mdo and team

[1] https://github.com/twbs/bootstrap/issues/20631

[2] https://news.ycombinator.com/item?id=12435425

[3] https://github.com/twbs/bootstrap/issues/16913