What is the stable9 theme? When should I use it instead of stable?

https://www.drupal.org/node/3066038

Has this cryptic statement:

However, defaulting to base theme: stable prevents automatic updates to the next major version of Drupal, since each major version may have a different version of "the stable theme"

and proceeds to list these without any explanation.

The READMEs in the relevant directories are no help.

Warning: Themes that opt out of using Stable as a base theme will need continuous maintenance as core changes, so only opt out if you are prepared to keep track of those changes and how they affect your theme.

Warning: Themes that decide to not use Stable 9 as a base theme will need continuous maintenance as core changes, so only opt out if you are prepared to keep track of those changes and how they affect your theme.

I have a Drupal 8 theme, I am upgrading to Drupal 9 should I specify stable or stable9? This is really confusing.

This article was republished from its original source.
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What is the stable9 theme? When should I use it instead of stable?

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