userns identity 1:1 mapping is a pretty useful concept since it isolates capability sets between containers and hosts, even if it doesn't map any uid ranges. Let's support it with an explicit concept. (Note that this is identical to --private-users=0:65536 (which in turn is identical to --private-users=0), but I think it makes to emphasize this concept as a high-level one that makes sense to support.)
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