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Returns a new string copied from +self+, with trailing characters possibly removed.
Removes <tt>"\r\n"</tt> if those are the last two characters.
"abc\r\n".chop # => "abc"
"тест\r\n".chop # => "тест"
"こんにちは\r\n".chop # => "こんにちは"
Otherwise removes the last character if it exists.
'abcd'.chop # => "abc"
'тест'.chop # => "тес"
'こんにちは'.chop # => "こんにち"
''.chop # => ""
If you only need to remove the newline separator at the end of the string, String#chomp is a better alternative.
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