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The main goals of this change are1)

1. Preserve existing behavior without any change to existing transform plugins.

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1. Handle the special case of a transform setup that consists of only the range transform.

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1. Not break the general case of multiple transforms.

As secondary goals, it would be handy for other transform plugins that are singletons to be able to reliably report the expected content length as this is the usual case (stacked transforms are relatively rare in actual deployment).