for (int i = 1; i <= 40; i++) {
      intValues.add(i);
    }
    // Now add values near 2^N for lots of values of N.
    for (int exponent : asList(2, 3, 4, 9, 15, 16, 17, 24, 25, 30)) {
      int x = 1 << exponent;
      intValues.add(x, x + 1, x - 1);
    }
    intValues.add(9999).add(10000).add(10001).add(1000000); // near powers of 10

    >>> decimal_encoder(Decimal("1.0"))
    1.0

    >>> decimal_encoder(Decimal("1"))
    1

    >>> decimal_encoder(Decimal("NaN"))
    nan
    """
    exponent = dec_value.as_tuple().exponent
    if isinstance(exponent, int) and exponent >= 0:
        return int(dec_value)
    else:
        return float(dec_value)


ENCODERS_BY_TYPE: dict[type[Any], Callable[[Any], Any]] = {
    bytes: lambda o: o.decode(),

        // so log2(x) is never exactly exponent + 0.5.
        increment = (xScaled * xScaled) > 2.0;
        break;
      default:
        throw new AssertionError();
    }
    return increment ? exponent + 1 : exponent;
  }

  private static final double LN_2 = log(2);

  /**
   * Returns {@code true} if {@code x} represents a mathematical integer.

   *
   * @throws IllegalArgumentException if {@code k < 0}
   */
  @GwtIncompatible // failing tests
  public static int pow(int b, int k) {
    checkNonNegative("exponent", k);
    switch (b) {
      case 0:
        return (k == 0) ? 1 : 0;
      case 1:
        return 1;
      case -1:
        return ((k & 1) == 0) ? 1 : -1;
      case 2:

            for (String expMarker : ImmutableList.of("p", "P")) {
              for (String exponent : ImmutableList.of("0", "-5", "+20", "52")) {
                for (String typePart : ImmutableList.of("", "D", "F", "d", "f")) {
                  checkTryParse(
                      signChar + hexPrefix + iPart + fPart + expMarker + exponent + typePart);
                }
              }
            }
          }
        }

            for (String expMarker : ImmutableList.of("p", "P")) {
              for (String exponent : ImmutableList.of("0", "-5", "+20", "52")) {
                for (String typePart : ImmutableList.of("", "D", "F", "d", "f")) {
                  checkTryParse(
                      signChar + hexPrefix + iPart + fPart + expMarker + exponent + typePart);
                }
              }
            }
          }
        }

            for (String expMarker : ImmutableList.of("p", "P")) {
              for (String exponent : ImmutableList.of("0", "-5", "+20", "52")) {
                for (String typePart : ImmutableList.of("", "D", "F", "d", "f")) {
                  checkTryParse(
                      signChar + hexPrefix + iPart + fPart + expMarker + exponent + typePart);
                }
              }
            }
          }
        }

            for (String expMarker : ImmutableList.of("p", "P")) {
              for (String exponent : ImmutableList.of("0", "-5", "+20", "52")) {
                for (String typePart : ImmutableList.of("", "D", "F", "d", "f")) {
                  checkTryParse(
                      signChar + hexPrefix + iPart + fPart + expMarker + exponent + typePart);
                }
              }
            }
          }
        }

	if c == 'e' || c == 'E' {
		isFloat = true
		d.scratch.add(c)

		if c = d.next(); c == '+' || c == '-' {
			d.scratch.add(c)
			if c = d.next(); c < '0' || c > '9' {
				return 0, d.mkError(ErrSyntax, "in exponent of numeric literal")
			}
			d.scratch.add(c)
		}
		for ; c >= '0' && c <= '9'; c = d.next() {
			d.scratch.add(c)
		}
	}

	if isFloat {
		var (
			err error
			sn  string
		)

   * time.
   *
   * @throws IllegalArgumentException if {@code k < 0}
   */
  @GwtIncompatible // TODO
  public static long pow(long b, int k) {
    checkNonNegative("exponent", k);
    if (-2 <= b && b <= 2) {
      switch ((int) b) {
        case 0:
          return (k == 0) ? 1 : 0;
        case 1:
          return 1;
        case -1: