Merge pull request #111 from alexandre-daubois/explicit-nullable-type

lib/InMemoryStream.php

@@ -15,7 +15,7 @@ final class InMemoryStream implements InputStream
  /**
  * @param string|null $contents Data chunk or `null` for no data chunk.
  */
- public function __construct(string $contents = null)
+ public function __construct(?string $contents = null)
  {
  $this->contents = $contents;
  }

lib/LineReader.php

@@ -19,7 +19,7 @@ final class LineReader
  /** @var InputStream */
  private $source;
 
- public function __construct(InputStream $inputStream, string $delimiter = null)
+ public function __construct(InputStream $inputStream, ?string $delimiter = null)
  {
  $this->source = $inputStream;
  $this->delimiter = $delimiter === null ? "\n" : $delimiter;

lib/PendingReadError.php

@@ -10,7 +10,7 @@ final class PendingReadError extends \Error
  public function __construct(
  string $message = "The previous read operation must complete before read can be called again",
  int $code = 0,
- \Throwable $previous = null
+ ?\Throwable $previous = null
  ) {
  parent::__construct($message, $code, $previous);
  }

lib/ResourceOutputStream.php

@@ -35,7 +35,7 @@ final class ResourceOutputStream implements OutputStream
  * @param resource $stream Stream resource.
  * @param int|null $chunkSize Chunk size per `fwrite()` operation.
  */
- public function __construct($stream, int $chunkSize = null)
+ public function __construct($stream, ?int $chunkSize = null)
  {
  if (!\is_resource($stream) || \get_resource_type($stream) !== 'stream') {
  throw new \Error("Expected a valid stream");