merge revision(s) 57649,57651: [Backport #13222]
array.c: finish_exact_sum * array.c (finish_exact_sum): extract duplicate code from rb_ary_sum. array.c: check if numeric * array.c (finish_exact_sum): add 0 and the initial value to check if the latter is numeric. [ruby-core:79572] [Bug #13222]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@61361 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 57649,57651: [Backport #13222]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@61361 b2dd03c8-39d4-4d8f-98ff-823fe69b080e