- There doesn't appear to be a meaningful scenario for injecting different readers/writers than stdin/stdout, and having InputOutputStreams complicates the API.
- Logically folks talk about "input and output", "readers and writers", etc., and "stdio" is "standard input and output", so having input specified first is less likely to be a source of bugs.
- Logger should be optional, not required, to simplify the common and getting-started cases.
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