case 0 <= r && r < surr1, surr3 <= r && r < surrSelf:
		// normal rune
		return append(a, uint16(r))
	case surrSelf <= r && r <= maxRune:
		// needs surrogate sequence
		r1, r2 := EncodeRune(r)
		return append(a, uint16(r1), uint16(r2))
	}
	return append(a, replacementChar)
}

// Decode returns the Unicode code point sequence represented
// by the UTF-16 encoding s.
func Decode(s []uint16) []rune {

     * @return The new path
     */
    public RelativePath plus(RelativePath other) {
        return append(other);
    }

    /**
     * Appends the given names to the end of this path.
     *
     * @param segments The names to append.
     * @param endsWithFile when true, the new path refers to a file.
     * @return The new path.
     */

	}
	buf = append(buf, "0x1"...)
	if len(hm) > 1 {
		buf = append(buf, '.')
		buf = append(buf, hm[1:]...)
	}

	buf = append(buf, 'p')
	if exp64 >= 0 {
		buf = append(buf, '+')
	} else {
		exp64 = -exp64
		buf = append(buf, '-')
	}
	// Force at least two exponent digits, to match fmt.
	if exp64 < 10 {
		buf = append(buf, '0')
	}

//go:build go1.16

package idna

// appendMapping appends the mapping for the respective rune. isMapped must be
// true. A mapping is a categorization of a rune as defined in UTS #46.
func (c info) appendMapping(b []byte, s string) []byte {
	index := int(c >> indexShift)
	if c&xorBit == 0 {
		p := index
		return append(b, mappings[mappingIndex[p]:mappingIndex[p+1]]...)
	}
	b = append(b, s...)
	if c&inlineXOR == inlineXOR {

/**
 * Appends value to the given Appendable and simple `\n` line separator after it.
 *
 * Always using the same line separator on all systems to allow for reproducible outputs.
 */
fun Appendable.appendReproducibleNewLine(value: CharSequence = ""): Appendable {
    assert('\r' !in value) {
        "Unexpected line ending in string."
    }
    return append(value).append("\n")

    }
  }

  @Override
  public Writer append(char c) throws IOException {
    checkNotClosed();
    target.append(c);
    return this;
  }

  @Override
  public Writer append(@CheckForNull CharSequence charSeq) throws IOException {
    checkNotClosed();
    target.append(charSeq);
    return this;
  }

  @Override

//go:build !go1.16

package idna

// appendMapping appends the mapping for the respective rune. isMapped must be
// true. A mapping is a categorization of a rune as defined in UTS #46.
func (c info) appendMapping(b []byte, s string) []byte {
	index := int(c >> indexShift)
	if c&xorBit == 0 {
		s := mappings[index:]
		return append(b, s[1:s[0]+1]...)
	}
	b = append(b, s...)
	if c&inlineXOR == inlineXOR {

		shouldPanic("cap out of range", func() { _ = append(t, make(T, 0, int64(n))...) })
		shouldPanic("len out of range", func() { _ = append(t, make(T, uint64(n))...) })
		shouldPanic("cap out of range", func() { _ = append(t, make(T, 0, uint64(n))...) })
		shouldPanic("len out of range", func() { _ = append(t, make(T, int(n))...) })
		shouldPanic("cap out of range", func() { _ = append(t, make(T, 0, int(n))...) })

    }
  }

  @Override
  public Writer append(char c) throws IOException {
    checkNotClosed();
    target.append(c);
    return this;
  }

  @Override
  public Writer append(@CheckForNull CharSequence charSeq) throws IOException {
    checkNotClosed();
    target.append(charSeq);
    return this;
  }

  @Override

        CacheVersion.of(2) > CacheVersion.of(1, 1)
        CacheVersion.of(1, 1) < CacheVersion.of(2)
    }

    def "appends component"() {
        expect:
        CacheVersion.empty().append(42) == CacheVersion.of(42)
        CacheVersion.of(42).append(23) == CacheVersion.of(42, 23)
        CacheVersion.of(42, 23).append(14) == CacheVersion.of(42, 23, 14)
    }

    def "copies input array"() {
        given: