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replacement= 

        # Encoding::Converter.replacement=

(from ruby core)
### Implementation from Converter
---
    ec.replacement = string

---

Sets the replacement string.

    ec = Encoding::Converter.new("utf-8", "us-ascii", :undef => :replace)
    ec.replacement = "<undef>"
    p ec.convert("a \u3042 b")      #=> "a <undef> b"

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