Fix too many dynamic plugins

Author: jdesrosiers

lib/core.js

@@ -27,7 +27,7 @@ export const validate = async (url, value = undefined, outputFormat = undefined)
 };
 
 export const compile = async (schema) => {
-  const ast = { metaData: {}, plugins: [] };
+  const ast = { metaData: {}, plugins: new Set() };
   const schemaUri = await Validation.compile(schema, ast);
   return { ast, schemaUri };
 };

lib/experimental.d.ts

@@ -76,7 +76,7 @@ export type Keyword<A> = {
 
 export type ValidationContext = {
   ast: AST;
-  plugins: EvaluationPlugin<unknown>[];
+  plugins: Set<EvaluationPlugin<unknown>>;
 };
 
 export type EvaluationPlugin<Context> = {

lib/keywords/validation.js

@@ -33,7 +33,7 @@ const compile = async (schema, ast) => {
       asyncMap(async ([keyword, keywordSchema]) => {
         const keywordHandler = getKeywordByName(keyword, schema.document.dialectId);
         if (keywordHandler.plugin) {
-          ast.plugins.push(keywordHandler.plugin);
+          ast.plugins.add(keywordHandler.plugin);
         }
         const keywordAst = await keywordHandler.compile(keywordSchema, ast, schema);
         return [keywordHandler.id, pointerAppend(keyword, canonicalUri(schema)), keywordAst];