LocalJsonPersist class

Save a simple-object in a file, in UTF-8 Json format.

Use save to save as Json:

var persist = LocalJsonPersist("xyz");
var simpleObj = "Hello";
await persist.saveJson(simpleObj);

Use load to load from Json:

var persist = LocalJsonPersist("xyz");
Object? decoded = await persist.loadJson();

Examples of valid JSON includes: 42 42.5 "abc" 1, 2, 3 "42", 123 {"42": 123}

Examples of invalid JSON includes: 4, 5, 6 // Not valid because Json does not allow two separate objects. 1, 2, 3 // Not valid because Json does not allow comma separated objects. 'abc' // Not valid because string must use double quotes. {42: "123"} // Not valid because a map key must be of type string.