A.1.1. Via file evaluation
When a tool that supports via files is invoked it:
Replaces the first specified --via via_file argument
with the sequence of argument words extracted from the via file,
including recursively processing any nested --via commands
in the via file.
Processes any subsequent --via via_file arguments
in the same way, in the order they are presented.
That is, via files are processed in the order you specify
them, and each via file is processed completely including processing
nested via files before processing the next via file.
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