Make retrieving meta-schemas more robust

Author: jdesrosiers

lib/core.js

@@ -43,7 +43,7 @@ subscribe("validate.metaValidate", async (_message, schema) => {
 
     // Compile
     if (!(schema.document.dialectId in metaValidators)) {
-      const metaSchema = await getSchema(schema.document.dialectId);
+      const metaSchema = await getSchema(schema.document.dialectId, schema);
       const compiledSchema = await compile(metaSchema);
       metaValidators[schema.document.dialectId] = interpret(compiledSchema);
     }

lib/schema.js

@@ -22,13 +22,15 @@ const schemaRegistry = {};
 export const getSchema = async (uri, browser = undefined) => {
   if (!browser) {
     browser = { _cache: {} };
+  }
 
-    for (const uri in schemaRegistry) {
+  for (const uri in schemaRegistry) {
+    if (!(uri in browser._cache)) {
       browser._cache[uri] = schemaRegistry[uri];
     }
   }
 
-  const schema = await browserGet(uri, browser);
+  const schema = await browserGet(uri, { ...browser });
   if (typeof schema.document.dialectId !== "string") {
     throw Error(`The document at ${schema.document.baseUri} is not a schema.`);
   }