unevaluatedItems property

Whether or not additional items in the list are allowed that don't match the items or prefixItems schemas.

For example, to define a schema for a list where only items matching prefixItems or items are allowed:

final schema = ListSchema(
  prefixItems: [Schema.string(), Schema.int()],
  items: Schema.bool(),
  unevaluatedItems: false,
);

In this schema, a list like ['hello', 42, true] would be valid, but ['hello', 42, true, 123] would be invalid because the last item does not match the schema defined by items (which applies to items beyond those covered by prefixItems), and unevaluatedItems is set to false, disallowing any items not explicitly matched by the schema.