Feature Request: Deep-merge data from multiple files

[alextremblay]

currently, data from multiple file variables are shallow-merged together, which is to say that if two data files each define a mapping/object with the same name and different keys, the mapping/object in the second data file replaces the mapping/object in the first file.

Ex: file1.json

{
    "key1": "value1",
    "key2": {
        "subkey1": "value"
    },
    "key3": "value"
}

file2.json

{
    "key1": "value2",
    "key2": {
        "subkey2": "value"
    }
}

Results in:

{
    "key1": "value2",
    "key2": {
        "subkey2": "value"
    },
    "key3": "value"
}

It would be nice if it instead resulted in

{
    "key1": "value2",
    "key2": {
         "subkey1": "value", 
         "subkey2": "value"
    },
    "key3": "value"
}