Fixing issues after tests

Author: dpanta94

src/Schema/Columns/Contracts/Column.php

@@ -211,7 +211,7 @@ public function set_name( string $name ): self {
 	 *
 	 * @return self
 	 */
-	public function set_default( mixed $default ): self {
+	public function set_default( $default ): self {
 		$this->default = $default;
 		return $this;
 	}

src/Schema/Columns/Contracts/Column_Interface.php

@@ -115,7 +115,7 @@ public function set_name( string $name ): self;
 	 *
 	 * @throws InvalidArgumentException If the default is not valid.
 	 */
-	public function set_default( mixed $default ): self;
+	public function set_default( $default ): self;
 
 	/**
 	 * Set the nullable of the column.

src/Schema/Columns/Created_At.php

@@ -11,7 +11,7 @@
 
 namespace StellarWP\Schema\Columns;
 
-use StellarWP\Schema\Columns\Contracts\Datetime_Column;
+use StellarWP\Schema\Columns\Datetime_Column;
 
 /**
  * Class Created_At
@@ -33,5 +33,5 @@ class Created_At extends Datetime_Column {
 	 *
 	 * @var string
 	 */
-	protected string $default = 'CURRENT_TIMESTAMP';
+	protected $default = 'CURRENT_TIMESTAMP';
 }

src/Schema/Columns/Last_Changed.php

@@ -11,7 +11,7 @@
 
 namespace StellarWP\Schema\Columns;
 
-use StellarWP\Schema\Columns\Contracts\Datetime_Column;
+use StellarWP\Schema\Columns\Datetime_Column;
 
 /**
  * Class Last_Changed
@@ -33,7 +33,7 @@ class Last_Changed extends Datetime_Column {
 	 *
 	 * @var string
 	 */
-	protected string $default = 'CURRENT_TIMESTAMP';
+	protected $default = 'CURRENT_TIMESTAMP';
 
 	/**
 	 * The on update value of the column.

src/Schema/Columns/Updated_At.php

@@ -11,7 +11,7 @@
 
 namespace StellarWP\Schema\Columns;
 
-use StellarWP\Schema\Columns\Contracts\Datetime_Column;
+use StellarWP\Schema\Columns\Datetime_Column;
 
 /**
  * Class Updated_At