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Returns a new string containing the downcased characters in +self+:
'HELLO'.downcase # => "hello"
'STRAẞE'.downcase # => "straße"
'ПРИВЕТ'.downcase # => "привет"
'RubyGems.org'.downcase # => "rubygems.org"
Some characters (and some character sets) do not have upcase and downcase versions;
see {Case Mapping}[rdoc-ref:case_mapping.rdoc]:
s = '1, 2, 3, ...'
s.downcase == s # => true
s = 'こんにちは'
s.downcase == s # => true
The casing is affected by the given +mapping+,
which may be +:ascii+, +:fold+, or +:turkic+;
see {Case Mappings}[rdoc-ref:case_mapping.rdoc@Case+Mappings].
Related: see {Converting to New String}[rdoc-ref:String@Converting+to+New+String].
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