Index: src/wp-includes/formatting.php
===================================================================
--- src/wp-includes/formatting.php	(revision 43639)
+++ src/wp-includes/formatting.php	(working copy)
@@ -5246,10 +5246,16 @@
 			if ( is_array( $v ) ) {
 				$value[ $k ] = wp_slash( $v );
 			} else {
+				if (is_bool( $v )) {
+					$v = (int) $v;
+				}
 				$value[ $k ] = addslashes( $v );
 			}
 		}
 	} else {
+		if ( is_bool( $value ) ) {
+			$value = (int) $value;
+		}
 		$value = addslashes( $value );
 	}