Simplify Reader codebase

src/Reader.php

@@ -218,10 +218,7 @@ public function fetchColumnByOffset(int $offset = 0): Iterator
 
     public function value(int|string $column = 0): mixed
     {
-        return match (true) {
-            is_string($column) => $this->first()[$column] ?? null,
-            default => array_values($this->first())[$column] ?? null,
-        };
+        return ResultSet::createFromTabularDataReader($this)->value($column);
     }
 
     /**
@@ -300,27 +297,15 @@ public function jsonSerialize(): array
      */
     public function each(Closure $closure): bool
     {
-        foreach ($this as $offset => $record) {
-            if (false === $closure($record, $offset)) {
-                return false;
-            }
-        }
-
-        return true;
+        return ResultSet::createFromTabularDataReader($this)->each($closure);
     }
 
     /**
      * @param Closure(array<mixed>, array-key=): bool $closure
      */
     public function exists(Closure $closure): bool
     {
-        foreach ($this as $offset => $record) {
-            if (true === $closure($record, $offset)) {
-                return true;
-            }
-        }
-
-        return false;
+        return ResultSet::createFromTabularDataReader($this)->exists($closure);
     }
 
     /**
@@ -333,11 +318,7 @@ public function exists(Closure $closure): bool
      */
     public function reduce(Closure $closure, mixed $initial = null): mixed
     {
-        foreach ($this as $offset => $record) {
-            $initial = $closure($initial, $record, $offset);
-        }
-
-        return $initial;
+        return ResultSet::createFromTabularDataReader($this)->reduce($closure, $initial);
     }
 
     /**

src/Serializer/ArrayShape.php

@@ -11,6 +11,8 @@
 
 namespace League\Csv\Serializer;
 
+use function in_array;
+
 enum ArrayShape: string
 {
     case List = 'list';