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Confidently wrong. Did you read the source I linked?

> The twelve-factor app stores config in environment variables

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The vault of the cloud provider would just inject the value of the environment variable securely so it doesn't have to be stored on-disk. What the parent poster wrote isn't wrong.
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The parent poster is wrongly quoting me to say the original post doesn't mean “env var”. Yes, it does mean env var.
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