I have three questions:
Whenever BJS team fixes a bug with a PR and closes the ticket - how can I get hold of the fixed version?
Is it true that the fix is immediately available in the playground, although the PG displays the latest released version?
Is there a way to use BJS from source? So to run master with the latest fixes?
Thank you very much,
. Jörg
It will be in our cdn the next day and deployed to npm once a week at the moment 
@RaananW can confirm I am not saying anything wrong
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This is correct. we update once a week (thursday morning PST)
Other alternative is to simply fork from master which is always up to date
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If you want to run from master you can check the guide here: Start Contributing to Babylon.js | Babylon.js Documentation (babylonjs.com) and of course if you have any questions or run into trouble along the way you can ask for help here 