EdgeInsetsDirectional
---
If the `value` is a `String`, `double`, or `int` then this will parse the number and pass it to `EdgeInsetsDirectional.all`. It creates insets where all the offsets are `value`.

{
    "padding": "30"
}

For creating insets with only the given `values`, padding may be a Map-like structure in the following JSON format:

{
    "padding": {
        "start": 45,
        "top": "100",
        "end": 35.8,
        "bottom": "12.2"
    }
}

Properties are optional, thus following JSON format is also valid.

{
    "padding": {
        "start": 19,
        "bottom": "22.2"  
    }
}