getFileUrl() appends gitHubUrl / repoName / branchName to $gitHubUrl. If $gitHubUrl was a formatting string then it could be generalized to other repository URLs, e.g. https://phabricator.wikimedia.org/diffusion/MW/browse/REL1_25/docs/skin.txt
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This should be reported at https://github.com/JeroenDeDauw/GitHub/issues instead as the maintainers do not use Wikimedia Phabricator for managing tasks.