> Let me clarify the idea. 
> If a filter recognizes '-' as a name for stdin,
> then stdin can be one of the _multiple_ files being processed.
> Filters that do not recognize '-' as a name, on the other hand,
> only process stdin if it is the _only_ input.

I understand that - is convenient, but it's not strictly needed.
If you need the standard input as one of several files (or as an
explicit file argument), you can pass /dev/stdin.

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