diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index fc1dd011e1..6a4d3e5151 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -6862,7 +6862,13 @@ function mbstring_binary_safe_encoding( $reset = false ) {
 	static $overloaded = null;
 
 	if ( is_null( $overloaded ) ) {
-		$overloaded = function_exists( 'mb_internal_encoding' ) && ( ini_get( 'mbstring.func_overload' ) & 2 ); // phpcs:ignore PHPCompatibility.IniDirectives.RemovedIniDirectives.mbstring_func_overloadDeprecated
+		if ( function_exists( 'mb_internal_encoding' )
+			&& ( (int) ini_get( 'mbstring.func_overload' ) & 2 ) // phpcs:ignore PHPCompatibility.IniDirectives.RemovedIniDirectives.mbstring_func_overloadDeprecated
+		) {
+			$overloaded = true;
+		} else {
+			$overloaded = false;
+		}
 	}
 
 	if ( false === $overloaded ) {
diff --git a/wp-includes/pomo/streams.php b/wp-includes/pomo/streams.php
index 3978d65791..a8a3755681 100644
--- a/wp-includes/pomo/streams.php
+++ b/wp-includes/pomo/streams.php
@@ -18,8 +18,15 @@ if ( ! class_exists( 'POMO_Reader', false ) ) :
 		 * PHP5 constructor.
 		 */
 		function __construct() {
-			$this->is_overloaded = ( ( ini_get( 'mbstring.func_overload' ) & 2 ) != 0 ) && function_exists( 'mb_substr' ); // phpcs:ignore PHPCompatibility.IniDirectives.RemovedIniDirectives.mbstring_func_overloadDeprecated
-			$this->_pos          = 0;
+			if ( function_exists( 'mb_substr' )
+				&& ( (int) ini_get( 'mbstring.func_overload' ) & 2 ) // phpcs:ignore PHPCompatibility.IniDirectives.RemovedIniDirectives.mbstring_func_overloadDeprecated
+			) {
+				$this->is_overloaded = true;
+			} else {
+				$this->is_overloaded = false;
+			}
+
+			$this->_pos = 0;
 		}
 
 		/**
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 9312cba50a..9f86ecbb10 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.8-alpha-51031';
+$wp_version = '5.8-alpha-51032';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.