Nope, no Metacello magic here. All the three named branches exist on
GitHub, where did you look?

https://github.com/hpi-swa/Squot/tree/latest-release

Am Fr., 14. Mai 2021 um 11:15 Uhr schrieb Christoph Thiede
<christoph.thiede at student.hpi.uni-potsdam.de>:
>
> I can't find this branch in the GitHub repository, is this a special shortcut for Metacello?
>
> Am 06.05.2021 15:21 schrieb commits at source.squeak.org:
>
> Marcel Taeumel uploaded a new version of Installer-Core to project The Trunk:
> http://source.squeak.org/trunk/Installer-Core-mt.440.mcz
>
> ==================== Summary ====================
>
> Name: Installer-Core-mt.440
> Author: mt
> Time: 6 May 2021, 3:21:07.381189 pm
> UUID: 4906fd3d-9eff-e841-afc5-0a75e5a9b4b6
> Ancestors: Installer-Core-mt.439
>
> Renames default branch for Git tools from "master" to "latest-release". Leave hints to "develop" branch for the brave among us. :-)
>
> master == latest-release ~~ develop
>
> =============== Diff against Installer-Core-mt.439 ===============
>
> Item was changed:
>   ----- Method: Installer class>>installGitInfrastructure (in category 'scripts') -----
>   installGitInfrastructure
>   | priorSetting |
>   "for INIFileTest>>#testComplexRead"
>   priorSetting := Scanner allowUnderscoreAsAssignment.
> + [Scanner allowUnderscoreAsAssignment: true.
> - Scanner allowUnderscoreAsAssignment: true.
>
>   (Smalltalk at: #Metacello) new
>     baseline: 'Squot';
> +   repository: 'github://hpi-swa/Squot:latest-release/src';
> + "repository: 'github://hpi-swa/Squot:develop/src';"
> -   repository: 'github://hpi-swa/Squot:master/src';
>     load.
>
> + ] ensure: [Scanner allowUnderscoreAsAssignment: priorSetting]
> - Scanner allowUnderscoreAsAssignment: priorSetting
>   !
>
>
>