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static boolean isEmpty(Collection c) { ret c == null || c.isEmpty(); } sbool isEmpty(File f) { ret f == null || f.length() == 0; } static boolean isEmpty(CharSequence s) { ret s == null || s.length() == 0; } static bool isEmpty(O[] a) { ret a == null || a.length == 0; } static bool isEmpty(byte[] a) { ret a == null || a.length == 0; } static boolean isEmpty(Map map) { ret map == null || map.isEmpty(); } ifclass DoubleRange sbool isEmpty(DoubleRange r) { ret r == null || r.isEmpty(); } endif ifclass AppendableChain sbool isEmpty(AppendableChain c) { ret c == null; } endif sbool isEmpty(IntSize l) { ret l == null || l.size() == 0; }