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util.promise: Remove some redundant checks, add tests confirming redundancy This lines don't appear to do anything useful, and all tests pass when they are removed. Discovered via mutation testing. I added extra tests to exercise this code, because I wasn't certain that there were no side-effects caused by removal. Everything appears to be fine, thanks to the "pending" check at the start of promise_settle().

local set = require "util.set";

return {
	available = set.new{
		-- mod_bookmarks bundled
		"mod_bookmarks";
		-- Roles, module.may and per-session authz
		"permissions";
	};
};