merge revision(s) 60071: [Backport #13953] [Backport #13954] [Backport #13955] [Backport #13957]
ext: check if null byte is contained [ruby-dev:50267] [Bug #13953]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@61456 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 60071: [Backport #13953] [Backport #13954] [Backport #13955] [Backport #13957]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@61456 b2dd03c8-39d4-4d8f-98ff-823fe69b080e