fix typing issues (#23)

src/Psl/Arr/sort_with_keys_by.php

@@ -52,6 +52,10 @@ function sort_with_keys_by(iterable $iterable, callable $scalar_func, ?callable
     );
 
     $sorted = sort_with_keys($tuples, $tuple_comparator);
+    /**
+     * @psalm-suppress InvalidArgument
+     * @psalm-suppress MixedArgumentTypeCoercion
+     */
     $result = Iter\map_with_key(
         $sorted,
         /**

src/Psl/Collection/IMutableVector.php

@@ -30,7 +30,7 @@ interface IMutableVector extends IVector, IMutableAccessibleCollection
     /**
      * Returns a `IMutableVector` containing the keys of the current `IMutableVector`.
      *
-     * @psalm-return IMutableVector<T>
+     * @psalm-return IMutableVector<int>
      */
     public function keys(): IMutableVector;
 

src/Psl/Collection/MutableVector.php

@@ -305,7 +305,10 @@ final class MutableVector implements IMutableVector
      */
     public function keys(): MutableVector
     {
-        return new MutableVector(Arr\keys($this->elements));
+        /** @psalm-var list<int> $keys */
+        $keys = Arr\keys($this->elements);
+
+        return new MutableVector($keys);
     }
 
     /**

src/Psl/Random/float.php

@@ -11,5 +11,8 @@ use Psl\Math;
  */
 function float(): float
 {
-    return (float) int(0, Math\INT53_MAX) / Math\INT53_MAX;
+    /** @var float|int $result */
+    $result = int(0, Math\INT53_MAX) / Math\INT53_MAX;
+
+    return (float) $result;
 }

src/Psl/Random/string.php

@@ -30,7 +30,7 @@ function string(int $length, ?string $alphabet = null): string
 
     $ret = '';
     while ($length > 0) {
-        $urandom_length = (int) Math\ceil(2 * $length * $bits / 8.0);
+        $urandom_length = (int) Math\ceil((float) (2 * $length * $bits) / 8.0);
         $data = bytes($urandom_length);
         $unpacked_data = 0;
         $unpacked_bits = 0;