load() with multipe configs doesn't "merge" it overwrites

[andrewebdev]

Not sure if this was intended, but if you use load() with a list of config files, the code overwrite the base config keys instead of merging the dictionaries. This fits my workflow where I may have a base configuration, and then have a local override based on the environment I'm working on. This override should be able to override a single setting nested amongst others, without losing other settings.

I ended up loading the two files separately and then writing my own merge function:

def merge_dicts(base, merge_dict):
    """
    Safely merges nested dictionaries
    """
    for k, v in merge_dict.items():
        if isinstance(v, collections.abc.Mapping):
            base[k] = merge_dicts(base.get(k, {}), v)
        else:
            base[k] = v
    return base

Maybe this something like this should be included in decode.load()? Maybe as a merged=True option?