# Get the Github commit with `sha`.
	#
	# Returns `null` if the commit cannot be found.
	#
	# ~~~nitish
	# var api = new GithubAPI(get_github_oauth)
	# var repo = api.get_repo("nitlang/nit")
	# assert repo != null
	# var commit = api.get_commit(repo, "64ce1f")
	# assert commit isa Commit
	# ~~~
	fun get_commit(repo_slug: String, sha: String): nullable Commit do
		return get("/repos/{repo_slug}/commits/{sha}").as(nullable Commit)
	end