The old method would replace objects one past one level deep instead of merging them. This method assumes a dictionary of dictionaries and runs the update() call one layer in instead of the root, which has the effect of preserving both sets of headers.
The old method would replace objects one past one level deep instead of merging them. This method assumes a dictionary of dictionaries and runs the update() call one layer in instead of the root, which has the effect of preserving both sets of headers.