We have came across a bug in Magento regarding Quantity is not accepting 0.5 on invoic and it is apparently a common issue. https://github.com/magento/magento2/pull/23943/files
I have found the solution on git hub but I just need some help regarding this.
I know you should not edit any file in vendor/… but try to overwrite it by put the files under app/… as you can see in the github solution.
My question is, when I have copied all of the files and put them under app/…. as referred in github, do i need to create a registration.php to make it work? and do i need anything else?
Any help is appreciated .