bringing back type constants for validation via new overrides vocabulary

validator/src/lib.rs

@@ -129,7 +129,7 @@ pub use {
 
 use std::{borrow::Cow, collections::HashMap, error::Error, fmt::Display};
 
-use ahash::AHashMap;
+use ahash::{AHashMap, AHashSet};
 use regex::Regex;
 use serde_json::{Number, Value};
 use util::*;
@@ -238,6 +238,7 @@ struct Schema {
   max_properties: Option<usize>,
   required: Vec<String>,
   properties: AHashMap<String, SchemaIndex>,
+  override_properties: AHashSet<String>,
   pattern_properties: Vec<(Regex, SchemaIndex)>,
   property_names: Option<SchemaIndex>,
   additional_properties: Option<Additional>,