I tried to create a module/component override in the template manager on an windows installation with the current staging branch. These are the errors I get:

The problem lies in administrator/components/com_templates/models/template.php at line 656

            $return = $this->createTemplateOverride($override . '/tmpl', $htmlPath);

respective Line 660

            $return = $this->createTemplateOverride($override . '/tmpl', $htmlPath);

When str_replace is invoked on Line 706

            $htmlFolder = $htmlPath . str_replace($overridePath, '', $folder);

one will get this - wrong - path as a result when using '/tmpl'
C:\Program Files (x86)\Ampps\www\joomla34\modules\mod_articles_category\tmpl/default.php

and this - right - path as a result when using DIRECTORY_SEPARATOR . 'tmpl'
/default.php

Should I change '/tmpl' to DIRECTORY_SEPARATOR . 'tmpl' or is there a better solution.