From: "Pierre P." <ppaysant@...>
Date: 2012-02-11T00:11:37+09:00
Subject: Re: str.encode! sets valid_encoding even if resulting string is invalid (1.9.3)

I'm observing the same problem. String#encode does not replace invalid
chars when {:invalid => :replace} option is used nor raises
Encoding::InvalidByteSequenceError when no option is set.

irb(main):023:0> f = File.open("test/fixtures/files/text.txt")
=> #<File:test/fixtures/files/text.txt>
irb(main):024:0> f.binmode
=> #<File:test/fixtures/files/text.txt>
irb(main):025:0> s = f.read
=> "This is a very simple sample text.\nIn latin1 \xE9ncoding \n"
irb(main):026:0> s.encoding
=> #<Encoding:ASCII-8BIT>
irb(main):027:0> u = s.encode('UTF-8', 'UTF-8', :invalid => :replace,
:undef => :replace)
=> "This is a very simple sample text.\nIn latin1 \xE9ncoding \n"
irb(main):028:0> u.valid_encoding?
=> true
irb(main):029:0> u.squeeze(" ")
ArgumentError: invalid byte sequence in UTF-8
  from (irb):29:in `squeeze'
  from (irb):29
  from /usr/local/ruby/1.9.3-p0/bin/irb:12:in `<main>'

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