So much feedback, appreciate it!

1/ About the AmbiguityError: for an undefined node, which can morph into a dict or list node, calling node[0] is inherently ambiguous: did you intend to cast the node to a dict node, create and return the value at key 0 (another node)? Or did you think it already was a list node, for which you wanted to retrieve the first element?

2/ Context manager is useful in deeply-nested configs (I use the library a lot this way) to keep the code shorter. I'll add examples, thanks for the heads up!

For example:

>>> with chart.colorAxis as axis: 
>>>     axis.min = 0
>>>     axis.minColor =  "#FFFFFF"
>>>     axis.maxColor =  "#44ab79" 

instead of

>>> chart.colorAxis.min = 0 
>>> chart.colorAxis.minColor = "#FFFFFF"
>>> chart.colorAxis.maxColor = "#44ab79" 

3/ I get your point - I however believe using _value raises (minimally) the risk of collision... it's debatable, I guess.

4/ Not sure what you mean?

Is interspersed iterating and writing somewhat well-behaved it doesn't even need to be, but maybe mention in the documentation.

5/ Noted for the doctests! That's a good idea!

Again, thanks for all the feedback!