From what I understand, anchor deploy will create the necessary accounts when deploying the first time. But I'm not sure what the difference is when I want to make updates to the program, whether I should just use anchor deploy again or what difference it makes if I use anchor upgrade instead.
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I've always been using anchor deploy, and it was automatically only upgrading if the same programID was already deployed before.
It seems older versions of anchor deploy by default always deployed a new programID, but for now, it automatically upgrades if an older version is already deployed.
A noteworthy difference is that anchor upgrade only deploys a single program, whereas anchor deploy deploys each program in the workspace.
