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encode! 

        # String.encode!

(from ruby core)
---
    str.encode!(encoding, **options)   -> str
    str.encode!(dst_encoding, src_encoding, **options)   -> str

---

The first form transcodes the contents of *str* from str.encoding to
`encoding`. The second form transcodes the contents of *str* from
src_encoding to dst_encoding. The `options` keyword arguments give
details for conversion. See String#encode for details. Returns the
string even if no changes were made.

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