0x1401,
	0x1885,
	0x2C00,
	0xA800,
	0xF900,
	0xFA30,
	0xFFDA,
	0xFFDC,
	0x10000,
	0x10300,
	0x10400,
	0x20000,
	0x2F800,
	0x2FA1D,
}

func TestDigit(t *testing.T) {
	for _, r := range testDigit {
		if !IsDigit(r) {
			t.Errorf("IsDigit(U+%04X) = false, want true", r)
		}
	}
	for _, r := range testLetter {
		if IsDigit(r) {
			t.Errorf("IsDigit(U+%04X) = true, want false", r)