Prototype: parsePort(String value) -> int accepts only one or more ASCII decimal digits, no signs/whitespace, and requires 1..65535. Invalid input raises IllegalArgumentException.
Final: parseOptions(String[] args) -> Options(int port,boolean verbose). Defaults: port 8080, verbose false. Accept --port followed by a parsePort value and/or --verbose in either order. Reject unknown flags, missing port values, repeated --port, repeated --verbose, and invalid ports. Return only after validating the full array, preserve args, and share no configuration state between calls.
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