Arvados

When you run arv edit under Ruby 2.1.4, doing normal edit work, there's an exception when it calls the Arvados API update method. You get the message Error communicating with server, error was undefined method `bytesize' for #<Hash:0x000000016b6740>. Here's the backtrace:

/usr/local/rvm/rubies/ruby-2.1.4/lib/ruby/2.1.0/net/http/generic_request.rb:179:in `send_request_with_body': undefined method `bytesize' for #<Hash:0x00000001abaf58> (NoMethodError)
        from /usr/local/rvm/rubies/ruby-2.1.4/lib/ruby/2.1.0/net/http/generic_request.rb:130:in `exec'
        from /usr/local/rvm/rubies/ruby-2.1.4/lib/ruby/2.1.0/net/http.rb:1406:in `block in transport_request'
        from /usr/local/rvm/rubies/ruby-2.1.4/lib/ruby/2.1.0/net/http.rb:1405:in `catch'
        from /usr/local/rvm/rubies/ruby-2.1.4/lib/ruby/2.1.0/net/http.rb:1405:in `transport_request'
        from /usr/local/rvm/rubies/ruby-2.1.4/lib/ruby/2.1.0/net/http.rb:1378:in `request'
        from /usr/local/rvm/rubies/ruby-2.1.4/lib/ruby/2.1.0/net/http.rb:1371:in `block in request'
        from /usr/local/rvm/rubies/ruby-2.1.4/lib/ruby/2.1.0/net/http.rb:853:in `start'
        from /usr/local/rvm/rubies/ruby-2.1.4/lib/ruby/2.1.0/net/http.rb:1369:in `request'
        from /usr/local/rvm/gems/ruby-2.1.4/gems/faraday-0.9.0/lib/faraday/adapter/net_http.rb:80:in `perform_request'
        from /usr/local/rvm/gems/ruby-2.1.4/gems/faraday-0.9.0/lib/faraday/adapter/net_http.rb:39:in `call'
        from /usr/local/rvm/gems/ruby-2.1.4/gems/faraday-0.9.0/lib/faraday/response.rb:8:in `call'
        from /usr/local/rvm/gems/ruby-2.1.4/gems/google-api-client-0.7.1/lib/google/api_client/request.rb:164:in `send'
        from /usr/local/rvm/gems/ruby-2.1.4/gems/google-api-client-0.7.1/lib/google/api_client.rb:598:in `block in execute!'
        from /usr/local/rvm/gems/ruby-2.1.4/gems/retriable-1.4.1/lib/retriable/retry.rb:27:in `perform'
        from /usr/local/rvm/gems/ruby-2.1.4/gems/retriable-1.4.1/lib/retriable.rb:15:in `retriable'
        from /usr/local/rvm/gems/ruby-2.1.4/gems/google-api-client-0.7.1/lib/google/api_client.rb:595:in `execute!'
        from /usr/local/rvm/gems/ruby-2.1.4/gems/google-api-client-0.7.1/lib/google/api_client.rb:634:in `execute'
        from /usr/local/rvm/gems/ruby-2.1.4/gems/arvados-cli-0.1.20141017205431/bin/arv:90:in `execute'
        from /usr/local/rvm/gems/ruby-2.1.4/gems/arvados-cli-0.1.20141017205431/bin/arv:303:in `arv_edit'
        from /usr/local/rvm/gems/ruby-2.1.4/gems/arvados-cli-0.1.20141017205431/bin/arv:123:in `check_subcommands'
        from /usr/local/rvm/gems/ruby-2.1.4/gems/arvados-cli-0.1.20141017205431/bin/arv:629:in `<top (required)>'
        from /usr/local/rvm/gems/ruby-2.1.4/bin/arv:23:in `load'
        from /usr/local/rvm/gems/ruby-2.1.4/bin/arv:23:in `<main>'
        from /usr/local/rvm/gems/ruby-2.1.4/bin/ruby_executable_hooks:15:in `eval'
        from /usr/local/rvm/gems/ruby-2.1.4/bin/ruby_executable_hooks:15:in `<main>'