val result = Headers.Builder()
  result.namesAndValues += namesAndValues
  return result
}

internal fun Headers.commonEquals(other: Any?): Boolean {
  return other is Headers && namesAndValues.contentEquals(other.namesAndValues)
}

internal fun Headers.commonHashCode(): Int = namesAndValues.contentHashCode()

internal fun Headers.commonToString(): String {
  return buildString {
    for (i in 0 until size) {