uniqueItems property Null safety
read / write
The value of this keyword MUST be a boolean.
If this keyword has boolean value false, the instance validates successfully. If it has boolean value true, the instance validates successfully if all of its elements are unique. If not present, this keyword may be considered present with boolean value false.
Implementation
/// If not present, this keyword may be considered present with boolean
/// value false.
bool? uniqueItems;