asList<E> method
For using this method, We're assuming it is safe to transform to utf8 Strings.
Return the bytes as a List decoded using jsonDecode(). Same as as().
If the List contains all String, you can do asList
Implementation
List<E> asList<E>(){
assert(_isStream != null && !_isStream);
return jsonDecode(asString()) as List<E>;
}