比较相等的字符串在Hash中找不到相同的对象

Question

我有两个相似的字符串:

context = "Marriott International World’s Most ADMIRED Lodging Company by FORTUNE for 14th yr. via @FortuneMagazine http://cnnmon.ie/1kcFZSQ"
slice_str = context.slice(105,24) # => "http://cnnmon.ie/1kcFZSQ"
str = "http://cnnmon.ie/1kcFZSQ"

slice_str == str                  # => true
slice_str.eql? str                # => true

但是当我在哈希中查找键是键的字符串时,它们不会在Ruby 2.1.0和Ruby 2.1.1中返回相同的内容:

redirects = {"http://cnnmon.ie/1kcFZSQ"=>""}
redirects.key?(slice_str)         # => false
redirects.key?(str)               # => true

这种行为有什么解释？Ruby 1.9.3按预期工作.

Answer 1

这是 ruby​​ < 2.1.3 中的一个错误

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$ rvm use 2.1.2\nUsing /Users/richniles/.rvm/gems/ruby-2.1.2\n$ irb\n2.1.2 :001 > context = "Marriott International World\xe2\x80\x99s Most ADMIRED Lodging Company by FORTUNE for 14th yr. via @FortuneMagazine http://cnnmon.ie/1kcFZSQ"\n => "Marriott International World\xe2\x80\x99s Most ADMIRED Lodging Company by FORTUNE for 14th yr. via @FortuneMagazine http://cnnmon.ie/1kcFZSQ" \n2.1.2 :002 > slice_str = context.slice(105,24) # => "http://cnnmon.ie/1kcFZSQ"\n => "http://cnnmon.ie/1kcFZSQ" \n2.1.2 :003 > str = "http://cnnmon.ie/1kcFZSQ"\n => "http://cnnmon.ie/1kcFZSQ" \n2.1.2 :004 > redirects = {"http://cnnmon.ie/1kcFZSQ"=>""}\n => {"http://cnnmon.ie/1kcFZSQ"=>""} \n2.1.2 :005 > redirects.key?(slice_str) \n => false \n2.1.2 :006 > redirects.key?(str)  \n => true \n

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但在 ruby​​ 2.1.3 中做同样的事情：

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 $ rvm use 2.1.3\n Using /Users/richniles/.rvm/gems/ruby-2.1.3\n $ irb\n 2.1.3 :001 > context = "Marriott International World\xe2\x80\x99s Most ADMIRED Lodging Company by FORTUNE for 14th yr. via @FortuneMagazine http://cnnmon.ie/1kcFZSQ"\n  => "Marriott International World\xe2\x80\x99s Most ADMIRED Lodging Company by FORTUNE for 14th yr. via @FortuneMagazine http://cnnmon.ie/1kcFZSQ" \n 2.1.3 :002 > slice_str = context.slice(105,24) # => "http://cnnmon.ie/1kcFZSQ"\n  => "http://cnnmon.ie/1kcFZSQ" \n 2.1.3 :003 > str = "http://cnnmon.ie/1kcFZSQ"\n  => "http://cnnmon.ie/1kcFZSQ" \n 2.1.3 :004 > redirects = {"http://cnnmon.ie/1kcFZSQ"=>""}\n  => {"http://cnnmon.ie/1kcFZSQ"=>""} \n 2.1.3 :005 > redirects.key?(slice_str) \n  => true \n 2.1.3 :006 > redirects.key?(str)  \n  => true \n

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