Stan fixes.

Author: Smoren

src/Structs/Slice.php

@@ -33,6 +33,7 @@ class Slice
  */
  public static function toSlice($s): Slice
  {
+ /** @var mixed $s */
  if ($s instanceof Slice) {
  return $s;
  }
@@ -42,6 +43,7 @@ public static function toSlice($s): Slice
  throw new ValueError("Invalid slice: \"{$str}\".");
  }
 
+ /** @var string $s */
  $slice = self::parseSliceString($s);
 
  return new Slice(...$slice);
@@ -92,7 +94,7 @@ public static function isSliceArray($s): bool
  return false;
  }
 
- if (!(\count($s) >= 0 && \count($s) <= 3)) {
+ if (\count($s) > 3) {
  return false;
  }