Index: src/wp-includes/functions.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- src/wp-includes/functions.php	(date 1471697247000)
+++ src/wp-includes/functions.php	(date 1471697373000)
@@ -2871,6 +2871,9 @@
  * @return string|false The JSON encoded string, or false if it cannot be encoded.
  */
 function wp_json_encode( $data, $options = 0, $depth = 512 ) {
+	// Prepare the data for JSON serialization.
+	$data = _wp_json_prepare_data( $data );
+
 	/*
 	 * json_encode() has had extra params added over the years.
 	 * $options was added in 5.3, and $depth in 5.5.
@@ -2883,9 +2886,6 @@
 	} else {
 		$args = array( $data );
 	}
-
-	// Prepare the data for JSON serialization.
-	$args[0] = _wp_json_prepare_data( $data );
 
 	$json = @call_user_func_array( 'json_encode', $args );