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add issue number for Array#sum incompatitbility description.

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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55031 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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akr 2016-05-17 13:26:24 +00:00
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commit 341b34d733
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@ -78,8 +78,9 @@ with all sufficient information, see the ChangeLog file or Redmine
=== Compatibility issues (excluding feature bug fixes)
* Array#sum is implemented. Ruby itself has no compatibility problem
because Ruby didn't have sum method for arrays before Ruby 2.4.
* Array#sum is implemented. [Feature #12217]
Ruby itself has no compatibility problem because Ruby didn't have sum method
for arrays before Ruby 2.4.
However many third party gems, activesupport, facets, simple_stats, etc,
defines sum method. These implementations are mostly compatible but
there are subtle differences.