System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. (Parameter 'index')
   at System.Collections.Generic.List`1.get_Item(Int32 index)
   at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Boolean& found)
   at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1 source)
   at Json.Schema.JsonSchema.CheckScopedConstraints(DynamicScope scope)
   at Json.Schema.JsonSchema.BuildConstraint(JsonPointer evaluationPath, JsonPointer baseInstanceLocation, JsonPointer relativeInstanceLocation, DynamicScope scope)
   at Json.Schema.JsonSchema.GetConstraint(JsonPointer relativeEvaluationPath, JsonPointer baseInstanceLocation, JsonPointer relativeInstanceLocation, EvaluationContext context)
   at Json.Schema.ItemsKeyword.GetConstraint(SchemaConstraint schemaConstraint, IReadOnlyList`1 localConstraints, EvaluationContext context)
   at Json.Schema.JsonSchema.PopulateConstraint(SchemaConstraint constraint, EvaluationContext context)
   at Json.Schema.JsonSchema.Evaluate(JsonNode root, EvaluationOptions options)
   at ConsoleApp13.Program.<>c__DisplayClass0_0.<Main>b__0(Int32 s) 

JsonSchema schema = new JsonSchemaBuilder()
 .Type(SchemaValueType.Array)
 .PrefixItems(
     new JsonSchemaBuilder()
         .Type(SchemaValueType.Integer),
     new JsonSchemaBuilder()
         .Type(SchemaValueType.Boolean)
 )
 .Items(new JsonSchemaBuilder()
     .Type(SchemaValueType.String)
 );

var instance = new JsonArray { 1, true, "foo", "bar" };

Parallel.ForEach(Enumerable.Range(1, 100000), (x) =>
{
    var options = new EvaluationOptions(); // Create new options everytime to call `_constraints.Clear()`
    var results = schema.Evaluate(instance, options);
});