Bug #1836: Can change encoding on frozen String
http://redmine.ruby-lang.org/issues/show/1836

Author: Brian Candler
Status: Open, Priority: Normal
ruby -v: ruby 1.9.2dev (2009-07-18 trunk 24186) [i686-linux]

String#encode! lets you change the encoding on a frozen String, as long as the character sequence is unchanged by the operation.

>> s = "hello"
=> "hello"
>> s.freeze
=> "hello"
>> s.encode!("ISO-8859-1")
=> "hello"
>> s.encoding
=> #<Encoding:ISO-8859-1>
>>


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