Closes sebastianbergmann#671

Author: sebastianbergmann

ChangeLog.md

@@ -2,6 +2,12 @@
 
 All notable changes of the php-code-coverage 6.1 release series are documented in this file using the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
 
+## [7.0.3] - 2019-MM-DD
+
+### Fixed
+
+* Fixed [#671](https://github.com/sebastianbergmann/php-code-coverage/issues/671): `TypeError` when directory name is a number
+
 ## [7.0.2] - 2019-02-15
 
 ### Changed
@@ -64,6 +70,7 @@ All notable changes of the php-code-coverage 6.1 release series are documented i
 * Class names are now abbreviated (unqualified name shown, fully qualified name shown on hover) in the file view of the HTML report
 * Update HTML report to Bootstrap 4
 
+[7.0.3]: https://github.com/sebastianbergmann/php-code-coverage/compare/7.0.2...7.0.3
 [7.0.2]: https://github.com/sebastianbergmann/php-code-coverage/compare/7.0.1...7.0.2
 [7.0.1]: https://github.com/sebastianbergmann/php-code-coverage/compare/7.0.0...7.0.1
 [7.0.0]: https://github.com/sebastianbergmann/php-code-coverage/compare/6.1.4...7.0.0

src/Node/Builder.php

@@ -35,6 +35,8 @@ public function build(CodeCoverage $coverage): Directory
     private function addItems(Directory $root, array $items, array $tests, bool $cacheTokens): void
     {
         foreach ($items as $key => $value) {
+            $key = (string) $key;
+
             if (\substr($key, -2) === '/f') {
                 $key = \substr($key, 0, -2);