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parse 

        # OptionParser.parse

(from ruby core)
---
    parse(*argv, into: nil)

---

Parses command line arguments `argv` in order when environment variable
POSIXLY_CORRECT is set, and in permutation mode otherwise. When optional
`into` keyword argument is provided, the parsed option values are stored
there via `[]=` method (so it can be Hash, or OpenStruct, or other
similar object).

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