it should work as advertised

It does since conflict resolution is not advertised to my knowledge.

How would you know if it was the intended effect?

It's called anticipation of common pitfall in language design.

If there were such a bizzare exception

It applies the rightmost applicable "one" modifier if any. Otherwise, it applies the rightmost applicable "all" modifier if any.

What part of that is "a bizarre exception"? (Upd: The answer is that this isn't what's happening. Counter example "\Lfoo\ubar". )

In reply to Re^5: I'm surprized with \L, \l, \U and \u, are you too? :-) by ikegami
in thread I'm surprized with \L, \l, \U and \u, are you too? :-) by Serge314

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