The resulting inspector behaves similarly to a
Store created via
Store.mapNull. This means that the resulting Inspector.path will be the same as if
mapNull was called on an equivalent store of the same value.
When updating the value of the resulting Store to this default value, null is used instead updating the parent. When this Store's value would be null according to it's parent's value, the default value will be used instead.
value to translate null to and from