[]rune{0xffff, 0x10000, 0x10001, 0x12345, 0x10ffff}},
	{[]uint16{0xd800, 'a'}, []rune{0xfffd, 'a'}},
	{[]uint16{0xdfff}, []rune{0xfffd}},
}

func TestAllocationsDecode(t *testing.T) {
	testenv.SkipIfOptimizationOff(t)

	for _, tt := range decodeTests {
		allocs := testing.AllocsPerRun(10, func() {
			out := Decode(tt.in)
			if out == nil {