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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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@ -78,8 +78,9 @@ with all sufficient information, see the ChangeLog file or Redmine
=== Compatibility issues (excluding feature bug fixes) === Compatibility issues (excluding feature bug fixes)
* Array#sum is implemented. Ruby itself has no compatibility problem * Array#sum is implemented. [Feature #12217]
because Ruby didn't have sum method for arrays before Ruby 2.4. 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, However many third party gems, activesupport, facets, simple_stats, etc,
defines sum method. These implementations are mostly compatible but defines sum method. These implementations are mostly compatible but
there are subtle differences. there are subtle differences.