worker exception bug in gearman-ruby-3.0.7

[bcber]

I'm not good at english, just check POC:

=======================client.rb===========================
client = Gearman::Client.new(servers)
client.option_request("exceptions")
taskset = Gearman::TaskSet.new(client)
task = Gearman::Task.new('test', "test string")
task.retry_count = 3
task.on_exception {|ex| puts "This should never be called" }
taskset.add_task(task)
}
taskset.wait(100)

=======================worker.rb===========================
w = Gearman::Worker.new(servers)
w.add_ability('test') do |data,job|
puts data
data.reverseaaa
end
loop { w.work }

=======================error info===========================
/gems/gearman-ruby-3.0.7/lib/gearman/taskset.rb:287:in `tasks_in_progress': Got unexpected work_data with handle H:xxx:2775 from localhost:4730 (no task by that name) (Gearman::ProtocolError)

login into tasks_in_progress method:

def tasks_in_progress(hostport, handle, remove_task = false)
  js_handle = Util.handle_to_str(hostport, handle)
  tasks = remove_task ? @tasks_in_progress.delete(js_handle) : @tasks_in_progress[js_handle]
  if not tasks
    raise ProtocolError, "Got unexpected work_data with handle #{handle} from #{hostport} (no task by that name)"
  end
  tasks
end

==========================bug==============================
The parameter handle end with \u0000, so @tasks_in_progress.delete(js_handle) is nil. In @tasks_in_progress the record is "localhost:4730//H:localhost:2803", but handle is "localhost:4730//H:localhost:2803\u0000"。

==========================solution===========================
Resolve this like:
add line : handle = handle.chop if handle[-1,1].to_i == 0x00