What is the reasoning for tilde keywords for font packages?

[gentoo-newcomer]

I was surprised to see that I was missing some of the newer emojis. I noticed that the latest "stable" package of noto-emoji is from 2023. https://packages.gentoo.org/packages/media-fonts/noto-emoji

What is the reasoning behind this? Aren't those usually just otf or ttf files? What is needed to "promote" the packages to a stable variant? The current testing ebuild 20241003 refers to the stable release on GitHub. I am just wondering why they are both not stable.

[Banana]

Hello and welcome.

The latest version in the tree was just added, so it is too fresh to be stable.

https://gitweb.gentoo.org/repo/gentoo.git/log/media-fonts/noto-emoji?showmsg=1

Link to commit: https://gitweb.gentoo.org/repo/gentoo.git/commit/media-fonts/noto-emoji?id=be041e6f16e492d2f1bf87c78ea911846473af48
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[gentoo-newcomer]

Are the general guidelines for how long a package has to be testing before it is being moved to stable? For example if I want to add a new font to gentoo package registry.