feat: relax flag character restrictions to follow Python's optparse convention#54
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…onvention Allow non-letter characters in short flags (e.g. `-1`) and at the start of long flags (e.g. `--1flag`). Disallow `=` and whitespace in both short and long flags, as these would cause parsing ambiguity or failure. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Allow non-letter characters in short flags (e.g.
-1) and at the start of long flags (e.g.--1flag). Disallow=and whitespace in both short and long flags, as these would cause parsing ambiguity or failure.