Smarty $default_modifiers ignored by WHMCS

[Kian]

Tricky question about Smarty. vendor/smarty/smarty/libs/Smarty.class.php line 500

public $default_modifiers = array('upper');

I would expect that to see all Smarty variables of WHMCS in uppercase but in reality it works just on custom pages (the ones where I use new ClientArea();). I can't see where WHMCS loads and extends Smarty class but I suspect that it ignores or overrides all custom constants and user-defined methods including my $default_modifiers.

That said, does anyone know how play with the mysterious Smarty class of WHMCS so that it respects my customizations?

Edited November 6, 2018 by Kian

[Kian]

Edit: my fault. I was autoloading and registering my prefilter without force recompile = true.

Edited November 7, 2018 by Kian