Revert "Use advanced serialization (when available) for test worker communication"

This reverts commit 51fafed.

Author: novemberborn

lib/fork.js

@@ -14,12 +14,6 @@ const AVA_PATH = path.resolve(__dirname, '..');
 
 const workerPath = require.resolve('./worker/subprocess');
 
-const useAdvanced = process.versions.node >= '12.16.0';
-// FIXME: Fix this in api.js or cli.js.
-const serializeOptions = useAdvanced ?
-	options => JSON.parse(JSON.stringify(options)) : // Use JSON serialization to remove non-clonable values.
-	options => options;
-
 module.exports = (file, options, execArgv = process.execArgv) => {
 	let finished = false;
 
@@ -40,8 +34,7 @@ module.exports = (file, options, execArgv = process.execArgv) => {
 		cwd: options.projectDir,
 		silent: true,
 		env: {NODE_ENV: 'test', ...process.env, ...options.environmentVariables, AVA_PATH},
-		execArgv,
-		serialization: useAdvanced ? 'advanced' : 'json'
+		execArgv
 	});
 
 	subprocess.stdout.on('data', chunk => {
@@ -73,7 +66,7 @@ module.exports = (file, options, execArgv = process.execArgv) => {
 			}
 
 			if (message.ava.type === 'ready-for-options') {
-				send({type: 'options', options: serializeOptions(options)});
+				send({type: 'options', options});
 				return;
 			}