old_contents: #!/usr/bin/env python
  #
  # Licensed to the Apache Software Foundation (ASF) under one
  # or more contributor license agreements.  See the NOTICE file
  # distributed with this work for additional information
  # regarding copyright ownership.  The ASF licenses this file
  # to you under the Apache License, Version 2.0 (the
  # "License"); you may not use this file except in compliance
  # with the License.  You may obtain a copy of the License at
  #
  #   http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing,
  # software distributed under the License is distributed on an
  # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  # KIND, either express or implied.  See the License for the
  # specific language governing permissions and limitations
  # under the License.
  #
  
  from proton import symbol
  from proton.reactor import LinkOption
  
  class Capabilities(LinkOption):
      def __init__(self, capabilities):
          self.capabilities = [symbol(c) for c in capabilities]
  
      def apply(self, link):
          link.source.capabilities.put_object(self.capabilities)
  
new_contents: #!/usr/bin/env python
  #
  # Licensed to the Apache Software Foundation (ASF) under one
  # or more contributor license agreements.  See the NOTICE file
  # distributed with this work for additional information
  # regarding copyright ownership.  The ASF licenses this file
  # to you under the Apache License, Version 2.0 (the
  # "License"); you may not use this file except in compliance
  # with the License.  You may obtain a copy of the License at
  #
  #   http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing,
  # software distributed under the License is distributed on an
  # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  # KIND, either express or implied.  See the License for the
  # specific language governing permissions and limitations
  # under the License.
  #
  
  from proton import Array, Data, symbol, UNDESCRIBED
  from proton.reactor import LinkOption
  
  class Capabilities(LinkOption):
      def __init__(self, capabilities):
          self.capabilities = [symbol(c) for c in capabilities]
  
      def apply(self, link):
          link.source.capabilities.put_object(Array(UNDESCRIBED, Data.SYMBOL, *self.capabilities))
  
subject: fix encoding of capabilities