conf.gem :github => 'kjunichi/mruby-io', :branch => 'add-close_write'
cat close_write.rb
io = IO.popen("od -cx", "r+")
io.write 'hoge \t fugo!'
io.close_write
puts io.read
conf.gem :github => 'kjunichi/mruby-io', :branch => 'add-close_write'
cat close_write.rb
io = IO.popen("od -cx", "r+")
io.write 'hoge \t fugo!'
io.close_write
puts io.read