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cli: tweak how "is one file" predicate works
In effect, we switch from `path.is_file()` to `!path.is_dir()`. In cases where process substitution is used, for example, the path can actually have type "fifo" instead of "file." Even if it's a fifo, we want to treat it as-if it were a file. The real key here is that we basically always want to consider a lone argument as a file so long as we know it isn't a directory. Because a directory is the only thing that will causes us to (potentially) search more than one thing. Fixes #2736
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