Use strict equality comparators (=== and !==)

The Validator was doing some interesting things with different types on getSize. Now fixed. The tests pass for this but I'm not sure if it's still behaving as expected.

The 2 tests in DatabaseMigrationResetCommandTest are now hanging after opening the file /Mockery/MethodCall.php, which points to something wrong in Illuminate\Database\Migrations\Migrator, but the changes there seems fine.