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By giving priority to --background= we prevent users from opting out of coloring if an explicit color is chosen by a tool wrapping one of our own tools. Instead, let's give priority to the environment variable, so that even if our tools are wrapped by another tool with a different background, users can still opt out of coloring just by setting the environment variable, which has a high chance of being forwarded to the invocation of our own tools which makes it easy to use to disable color tinting globally if requested by the user.