): Headers {
      val result = Headers.Builder()

      for (index in 0 until cachedHeaders.size) {
        val fieldName = cachedHeaders.name(index)
        val value = cachedHeaders.value(index)
        if ("Warning".equals(fieldName, ignoreCase = true) && value.startsWith("1")) {
          // Drop 100-level freshness warnings.
          continue
        }
        if (isContentSpecificHeader(fieldName) ||

        is CharValue -> KtConstantValue.KtCharConstantValue(value, sourcePsi = null)
        is IntValue -> KtConstantValue.KtIntConstantValue(value, sourcePsi = null)
        is LongValue -> KtConstantValue.KtLongConstantValue(value, sourcePsi = null)
        is ShortValue -> KtConstantValue.KtShortConstantValue(value, sourcePsi = null)

        this.name = name
      }

    fun value(value: String) =
      apply {
        require(value.trim() == value) { "value is not trimmed" }
        this.value = value
      }

    fun expiresAt(expiresAt: Long) =
      apply {
        var expiresAt = expiresAt
        if (expiresAt <= 0L) expiresAt = Long.MIN_VALUE
        if (expiresAt > MAX_DATE) expiresAt = MAX_DATE

    assertThat(parse(url, "a=\r\t \n")!!.value).isEqualTo("")
  }

  @Test fun trimLeadingAndTrailingWhitespaceFromValue() {
    assertThat(parse(url, "a= ")!!.value).isEqualTo("")
    assertThat(parse(url, "a= b")!!.value).isEqualTo("b")
    assertThat(parse(url, "a=b ")!!.value).isEqualTo("b")
    assertThat(parse(url, "a=\r\t \nb\n\t \n")!!.value).isEqualTo("b")
  }

  @Test fun invalidCharacters() {

                <mxCell id="0"/>
                <mxCell id="1" parent="0"/>
                <mxCell id="2" value="" style="rounded=0;whiteSpace=wrap;html=1;fontStyle=1;strokeWidth=4;" parent="1" vertex="1">
                    <mxGeometry x="450" y="-50" width="820" height="970" as="geometry"/>
                </mxCell>

pkg go/build, const IgnoreVendor ImportMode
pkg go/build, type Package struct, InvalidGoFiles []string
pkg go/constant, func ToComplex(Value) Value
pkg go/constant, func ToFloat(Value) Value
pkg go/constant, func ToInt(Value) Value
pkg go/constant, type Value interface, ExactString() string
pkg go/types, method (*Package) SetName(string)
pkg go/types, type ImportMode int

So:

```Python
q: Union[str, None] = Query(default=None)
```

...makes the parameter optional, with a default value of `None`, the same as:

```Python

pkg go/constant, func Num(Value) Value
pkg go/constant, func Real(Value) Value
pkg go/constant, func Shift(Value, token.Token, uint) Value
pkg go/constant, func Sign(Value) int
pkg go/constant, func StringVal(Value) string
pkg go/constant, func Uint64Val(Value) (uint64, bool)
pkg go/constant, func UnaryOp(token.Token, Value, uint) Value
pkg go/constant, type Kind int
pkg go/constant, type Value interface, Kind() Kind

  // The maximum number of DaemonSet pods that can be unavailable during the
  // update. Value can be an absolute number (ex: 5) or a percentage of total
  // number of DaemonSet pods at the start of the update (ex: 10%). Absolute
  // number is calculated from percentage by rounding up.
  // This cannot be 0 if MaxSurge is 0
  // Default value is 1.
  // Example: when this is set to 30%, at most 30% of the total number of nodes

  }

  @Test @Disabled
  fun cookie() {
    val cookie: Cookie = Cookie.Builder().build()
    val name: String = cookie.name()
    val value: String = cookie.value()
    val persistent: Boolean = cookie.persistent()
    val expiresAt: Long = cookie.expiresAt()
    val hostOnly: Boolean = cookie.hostOnly()
    val domain: String = cookie.domain()