Added a fix ensuring attributes are merged correctly

Author: puzzledpolymath

src/Table/Column.php

@@ -140,11 +140,7 @@ public function render(AbstractColumn $column): void
 
         if ($this->hasDefault() && $this->getDefault() !== null) {
             $column->defaultValue($this->getDefault());
-            return;
-        }
-
-        if ($this->hasOption(self::OPT_CAST_DEFAULT)) {
-            // cast default value
+        } elseif ($this->hasOption(self::OPT_CAST_DEFAULT)) {
             $column->defaultValue($this->castDefault($column));
         }
 

tests/Schema/Driver/MySQL/ColumnTest.php

@@ -86,7 +86,7 @@ public function testUnsignedColumnWithAdditionalAttributesAndDefault(): void
         $this->assertTrue($table->hasColumn('foo'));
         $this->assertArrayHasKey('comment', $table->column('foo')->getAttributes());
         $this->assertArrayHasKey('unsigned', $table->column('foo')->getAttributes());
-        $this->assertFalse($table->column('foo')->getDefaultValue());
+        $this->assertSame(0, $table->column('foo')->getDefaultValue());
         $this->assertSame($comment, $table->column('foo')->getAttributes()['comment']);
         $this->assertSame($comment, $table->column('foo')->getComment());
         $this->assertTrue($table->column('foo')->getAttributes()['unsigned']);