// not include vertical tabs (\v).
		case ' ', '\t', '\n', '\r':
		default:
			return true
		}
	}
	return false
}

// qDecode decodes a Q encoded string.
func qDecode(s string) ([]byte, error) {
	dec := make([]byte, len(s))
	n := 0
	for i := 0; i < len(s); i++ {
		switch c := s[i]; {
		case c == '_':
			dec[n] = ' '
		case c == '=':

		// timestamps.
		ByteStringToTime: cbor.ByteStringToTimeAllowed,
	}.DecMode()
	if err != nil {
		panic(err)
	}
	return decode
}()

// DecodeLax is derived from Decode, but does not complain about unknown fields in the input.
var DecodeLax cbor.DecMode = func() cbor.DecMode {
	opts := Decode.DecOptions()
	opts.ExtraReturnErrors &^= cbor.ExtraDecErrorUnknownField // clear bit
	dm, err := opts.DecMode()
	if err != nil {

	}

	// If we cannot decode, just return read quorum error.
	return nil, fmt.Errorf("%w (offline-disks=%d/%d)", errErasureReadQuorum, disksNotFound, len(p.readers))
}

// Decode reads from readers, reconstructs data if needed and writes the data to the writer.
// A set of preferred drives can be supplied. In that case they will be used and the data reconstructed.

// destination. It's used when calling Decode with a nil value.
func (dec *Decoder) ignoreSingle(engine *decEngine) {
	state := dec.newDecoderState(&dec.buf)
	defer dec.freeDecoderState(state)
	state.fieldnum = singletonField
	delta := int(state.decodeUint())
	if delta != 0 {
		errorf("decode: corrupted data: non-zero delta for singleton")
	}
	instr := &engine.instr[singletonField]

	rv := reflect.ValueOf(v)
	if rv.Kind() != reflect.Pointer || rv.IsNil() {
		return &InvalidUnmarshalError{reflect.TypeOf(v)}
	}

	d.scan.reset()
	d.scanWhile(scanSkipSpace)
	// We decode rv not rv.Elem because the Unmarshaler interface
	// test must be applied at the top level of the value.
	err := d.value(rv)
	if err != nil {
		return d.addErrorContext(err)
	}
	return d.savedError
}

	in, out any
}

var ignoreTests = []ignoreTest{
	// Decode normal struct into an empty struct
	{&struct{ A int }{23}, &struct{}{}},
	// Decode normal struct into a nil.
	{&struct{ A int }{23}, nil},
	// Decode singleton string into a nil.
	{"hello, world", nil},
	// Decode singleton slice into a nil.
	{[]int{1, 2, 3, 4}, nil},
	// Decode struct containing an interface into a nil.

        when:
        decode([] as byte[]) { Decoder decoder ->
            decoder.readBinary()
        }

        then:
        thrown(EOFException)
    }

    def "can encode and decode long #value"() {
        expect:
        def bytes = encode { Encoder encoder ->
            encoder.writeLong(value)
        }
        decode(bytes) { Decoder decoder ->

    }

    override suspend fun ReadContext.decode(): NullValueSnapshot {
        return NullValueSnapshot.INSTANCE
    }
}


object IsolatedEnumValueSnapshotCodec : Codec<IsolatedEnumValueSnapshot> {
    override suspend fun WriteContext.encode(value: IsolatedEnumValueSnapshot) {
        write(value.value)
    }

    override suspend fun ReadContext.decode(): IsolatedEnumValueSnapshot {

        }
    }

    override suspend fun ReadContext.decode(): Array<*> =
        readArray {
            read()
        }
}


object ShortArrayCodec : Codec<ShortArray> {
    override suspend fun WriteContext.encode(value: ShortArray) =
        writeLengthPrefixedShorts(this, value)

    override suspend fun ReadContext.decode() =
        readLengthPrefixedShorts(this)
}

    assertNull(Punycode.decode("xn--a-9b.net"))
    assertEquals("a՚.net", Punycode.decode("xn--a-99b.net"))
    assertEquals("a溠.net", Punycode.decode("xn--a-999b.net"))
    assertEquals("a\uD8E2\uDF5C.net", Punycode.decode("xn--a-9999b.net"))
    assertNull(Punycode.decode("xn--a-99999b.net"))
  }

  @Test fun dashInPrefix() {
    testEncodeDecode(
      unicode = "klmnöpqrst-uvwxy",