description option of aplication create doesn't support characters other than ascii

$ podman run registry.redhat.io/3scale-amp2/toolbox-rhel8:3scale2.13 3scale application create  --description="テスト" https://<ACCESS_TOKEN>@3scale-admin.example.com 3 2 7 test
{
  "code": "E_UNKNOWN",
  "message": "\"\\xE3\" from ASCII-8BIT to UTF-8",
  "class": "Encoding::UndefinedConversionError",
  "stacktrace": [
    "/usr/share/ruby/json/common.rb:224:in `generate'",
    "/usr/share/ruby/json/common.rb:224:in `generate'",
    "/opt/toolbox/vendor/bundle/ruby/2.7.0/gems/3scale-api-1.6.0/lib/3scale/api/http_client.rb:150:in `encode'",
    "/opt/toolbox/vendor/bundle/ruby/2.7.0/gems/3scale-api-1.6.0/lib/3scale/api/http_client.rb:105:in `serialize'",
    "/opt/toolbox/vendor/bundle/ruby/2.7.0/gems/3scale-api-1.6.0/lib/3scale/api/http_client.rb:52:in `post'",
    "/opt/toolbox/vendor/bundle/ruby/2.7.0/gems/3scale-api-1.6.0/lib/3scale/api/client.rb:89:in `create_application'",
    "/opt/toolbox/lib/3scale_toolbox/remote_cache.rb:186:in `public_send'",
    "/opt/toolbox/lib/3scale_toolbox/remote_cache.rb:186:in `method_missing'",
    "/opt/toolbox/lib/3scale_toolbox/entities/application.rb:6:in `create'",
    "/opt/toolbox/lib/3scale_toolbox/commands/application_command/create_command.rb:41:in `run'",
    "/opt/toolbox/vendor/bundle/ruby/2.7.0/gems/cri-2.15.11/lib/cri/command_runner.rb:34:in `call'",
    "/opt/toolbox/vendor/bundle/ruby/2.7.0/gems/cri-2.15.11/lib/cri/command_dsl.rb:294:in `block in runner'",
    "/opt/toolbox/vendor/bundle/ruby/2.7.0/gems/cri-2.15.11/lib/cri/command.rb:362:in `run_this'",
    "/opt/toolbox/vendor/bundle/ruby/2.7.0/gems/cri-2.15.11/lib/cri/command.rb:298:in `run'",
    "/opt/toolbox/vendor/bundle/ruby/2.7.0/gems/cri-2.15.11/lib/cri/command.rb:316:in `run'",
    "/opt/toolbox/vendor/bundle/ruby/2.7.0/gems/cri-2.15.11/lib/cri/command.rb:316:in `run'",
    "/opt/toolbox/lib/3scale_toolbox/cli.rb:48:in `block in run'",
    "/opt/toolbox/lib/3scale_toolbox/cli/error_handler.rb:5:in `block in error_watchdog'",
    "/opt/toolbox/lib/3scale_toolbox/cli/error_handler.rb:11:in `error_watchdog'",
    "/opt/toolbox/lib/3scale_toolbox/cli/error_handler.rb:5:in `error_watchdog'",
    "/opt/toolbox/lib/3scale_toolbox/cli.rb:45:in `run'",
    "/opt/toolbox/exe/3scale:15:in `<top (required)>'",
    "/opt/toolbox/bin/3scale:29:in `load'",
    "/opt/toolbox/bin/3scale:29:in `<main>'"
  ]

curl -v  -X POST "https://3scale-admin.example.com/admin/api/accounts/3/applications.xml" -d 'access_token=<ACCESS_TOKEN>&plan_id=7&name=test&description=%E3%83%86%E3%82%B9%E3%83%88'