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rstrip 

        # String.rstrip

(from ruby core)
---
    str.rstrip   -> new_str

---

Returns a copy of the receiver with trailing whitespace removed. See
also String#lstrip and String#strip.

Refer to String#strip for the definition of whitespace.

    "  hello  ".rstrip   #=> "  hello"
    "hello".rstrip       #=> "hello"

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