Issue #4603 has been reported by yu nobuoka.

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Bug #4603: lib/csv.rb: when the :encoding parameter is not provided, the encoding of CSV data is treated as ASCII-8BIT
http://redmine.ruby-lang.org/issues/4603

Author: yu nobuoka
Status: Open
Priority: Normal
Assignee: 
Category: lib
Target version: 
ruby -v: ruby 1.9.2p188 (2011-03-28 revision 31204) [x86_64-linux]


This issue is involved in three methods, CSV::open, CSV::read and CSV::foreach.

The document of CSV::read says "This method also understands an additional 
:encoding parameter that you can use to specify the Encoding of the data 
in the file to be read. You must provide this unless your data is in 
Encoding::default_external()."
However, when the :encoding parameter is not provided, the encoding of the CSV data 
is treated as ASCII-8BIT. Not as Encoding.default_external.
CSV::open and CSV::foreach are also similar. 

I think the actual behaviour of these methods doesn't conform to the document of these.


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