diff --git a/wp-includes/kses.php b/wp-includes/kses.php
index 31bc2b5e7a..7eeadca569 100644
--- a/wp-includes/kses.php
+++ b/wp-includes/kses.php
@@ -1088,16 +1088,20 @@ function wp_kses_split2( $content, $allowed_html, $allowed_protocols ) {
 	// Allow HTML comments.
 	if ( str_starts_with( $content, '<!--' ) ) {
 		$content = str_replace( array( '<!--', '-->' ), '', $content );
-		while ( ( $newstring = wp_kses( $content, $allowed_html, $allowed_protocols ) ) != $content ) {
+
+		while ( ( $newstring = wp_kses( $content, $allowed_html, $allowed_protocols ) ) !== $content ) {
 			$content = $newstring;
 		}
+
 		if ( '' === $content ) {
 			return '';
 		}
+
 		// Prevent multiple dashes in comments.
 		$content = preg_replace( '/--+/', '-', $content );
 		// Prevent three dashes closing a comment.
 		$content = preg_replace( '/-$/', '', $content );
+
 		return "<!--{$content}-->";
 	}
 
@@ -1357,6 +1361,7 @@ function wp_kses_hair( $attr, $allowed_protocols ) {
 				if ( preg_match( '/^\s+/', $attr ) ) { // Valueless.
 					$working = 1;
 					$mode    = 0;
+
 					if ( false === array_key_exists( $attrname, $attrarr ) ) {
 						$attrarr[ $attrname ] = array(
 							'name'  => $attrname,
@@ -1365,6 +1370,7 @@ function wp_kses_hair( $attr, $allowed_protocols ) {
 							'vless' => 'y',
 						);
 					}
+
 					$attr = preg_replace( '/^\s+/', '', $attr );
 				}
 
@@ -1386,6 +1392,7 @@ function wp_kses_hair( $attr, $allowed_protocols ) {
 							'vless' => 'n',
 						);
 					}
+
 					$working = 1;
 					$mode    = 0;
 					$attr    = preg_replace( '/^"[^"]*"(\s+|$)/', '', $attr );
@@ -1407,6 +1414,7 @@ function wp_kses_hair( $attr, $allowed_protocols ) {
 							'vless' => 'n',
 						);
 					}
+
 					$working = 1;
 					$mode    = 0;
 					$attr    = preg_replace( "/^'[^']*'(\s+|$)/", '', $attr );
@@ -1428,6 +1436,7 @@ function wp_kses_hair( $attr, $allowed_protocols ) {
 							'vless' => 'n',
 						);
 					}
+
 					// We add quotes to conform to W3C's HTML spec.
 					$working = 1;
 					$mode    = 0;
@@ -1437,13 +1446,13 @@ function wp_kses_hair( $attr, $allowed_protocols ) {
 				break;
 		} // End switch.
 
-		if ( 0 == $working ) { // Not well-formed, remove and try again.
+		if ( 0 === $working ) { // Not well-formed, remove and try again.
 			$attr = wp_kses_html_error( $attr );
 			$mode = 0;
 		}
 	} // End while.
 
-	if ( 1 == $mode && false === array_key_exists( $attrname, $attrarr ) ) {
+	if ( 1 === $mode && false === array_key_exists( $attrname, $attrarr ) ) {
 		/*
 		 * Special case, for when the attribute list ends with a valueless
 		 * attribute like "selected".
@@ -1707,9 +1716,9 @@ function wp_kses_bad_protocol( $content, $allowed_protocols ) {
 	do {
 		$original_content = $content;
 		$content          = wp_kses_bad_protocol_once( $content, $allowed_protocols );
-	} while ( $original_content != $content && ++$iterations < 6 );
+	} while ( $original_content !== $content && ++$iterations < 6 );
 
-	if ( $original_content != $content ) {
+	if ( $original_content !== $content ) {
 		return '';
 	}
 
@@ -1974,6 +1983,7 @@ function wp_kses_normalize_entities2( $matches ) {
 	}
 
 	$i = $matches[1];
+
 	if ( valid_unicode( $i ) ) {
 		$i = str_pad( ltrim( $i, '0' ), 3, '0', STR_PAD_LEFT );
 		$i = "&#$i;";
@@ -2003,6 +2013,7 @@ function wp_kses_normalize_entities3( $matches ) {
 	}
 
 	$hexchars = $matches[1];
+
 	return ( ! valid_unicode( hexdec( $hexchars ) ) ) ? "&amp;#x$hexchars;" : '&#x' . ltrim( $hexchars, '0' ) . ';';
 }
 
@@ -2015,10 +2026,13 @@ function wp_kses_normalize_entities3( $matches ) {
  * @return bool Whether or not the codepoint is a valid Unicode codepoint.
  */
 function valid_unicode( $i ) {
-	return ( 0x9 == $i || 0xa == $i || 0xd == $i ||
-			( 0x20 <= $i && $i <= 0xd7ff ) ||
-			( 0xe000 <= $i && $i <= 0xfffd ) ||
-			( 0x10000 <= $i && $i <= 0x10ffff ) );
+	$i = (int) $i;
+
+	return ( 0x9 === $i || 0xa === $i || 0xd === $i ||
+		( 0x20 <= $i && $i <= 0xd7ff ) ||
+		( 0xe000 <= $i && $i <= 0xfffd ) ||
+		( 0x10000 <= $i && $i <= 0x10ffff )
+	);
 }
 
 /**
diff --git a/wp-includes/version.php b/wp-includes/version.php
index c432ad5933..30dca32671 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.4-alpha-56376';
+$wp_version = '6.4-alpha-56377';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.