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downcase 

        # String.downcase

(from ruby core)
---
    downcase(*options) -> string

---

Returns a string containing the downcased characters in `self`:

    s = 'Hello World!' # => "Hello World!"
    s.downcase         # => "hello world!"

The casing may be affected by the given `options`; see [Case
Mapping](doc/case_mapping_rdoc.html).

Related: String#downcase!, String#upcase, String#upcase!.

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