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I have had a go at trying to fix the issue around the level described here: #58.
I am not sure if it is something you would want to add in but It does seem to solve the problem if replicate the scenario locally.
I have renamed the level method tree_level as suggested. I also think I have been able to allow level to to be used if level is not a column on the recode concerned. I have written some tests to cover such a scenario and tested manually in a rails app and it seem to work ok. Let me know what you think.
Also I spotted some typos in my previous work I have correct these and in the first commit so they can be cherry picked if the rest of the work is not wanted.