Installation script runs twice

[PhantomWatson]

> DataCenter\Console\Installer::postInstall
Created `config/app.php` file
App name ('app_name' by default):projects
Full base URL ('https://sitename.cberdata.org' by default):https://projects.cberdata.org
Created `config/.env.dev`
Updated header, APP_NAME, SECURITY_SALT, FULL_BASE_URL, COOKIE_ENCRYPTION_KEY in .env.dev
Created `config/.env.production`
Updated header, APP_NAME, DEBUG, SECURITY_SALT, FULL_BASE_URL, COOKIE_ENCRYPTION_KEY in .env.production
Created `config/.env`
Created `C:\xampp\htdocs\projects/logs` directory
Created `C:\xampp\htdocs\projects/tmp` directory
Created `C:\xampp\htdocs\projects/tmp/cache` directory
Created `C:\xampp\htdocs\projects/tmp/cache/models` directory
Created `C:\xampp\htdocs\projects/tmp/cache/persistent` directory
Created `C:\xampp\htdocs\projects/tmp/cache/views` directory
Created `C:\xampp\htdocs\projects/tmp/sessions` directory
Created `C:\xampp\htdocs\projects/tmp/tests` directory
Set Folder Permissions ? (Default to Y) [Y,n]?
Copied `bootstrap.min.js` into webroot
Copied `glyphicons-halflings-regular.eot` into webroot
Copied `glyphicons-halflings-regular.svg` into webroot
Copied `glyphicons-halflings-regular.ttf` into webroot
Copied `glyphicons-halflings-regular.woff` into webroot
Copied `glyphicons-halflings-regular.woff2` into webroot

That should be the end, but then postInstall is called again:

> DataCenter\Console\Installer::postInstall
App name ('app_name' by default):projects
Full base URL ('https://sitename.cberdata.org' by default):https://projects.cberdata.org
Set Folder Permissions ? (Default to Y) [Y,n]?
Copied `bootstrap.min.js` into webroot
Copied `glyphicons-halflings-regular.eot` into webroot
Copied `glyphicons-halflings-regular.svg` into webroot
Copied `glyphicons-halflings-regular.ttf` into webroot
Copied `glyphicons-halflings-regular.woff` into webroot
Copied `glyphicons-halflings-regular.woff2` into webroot

I assume that this is because of

"post-create-project-cmd": "DataCenter\\Console\\Installer::postInstall",
"post-install-cmd": "DataCenter\\Console\\Installer::postInstall",

in composer.json. This should either be prevented or at least noted in README.md that "Hey, it's going to call postInstall() twice because of dumb.".