Support valinor mapping

[momala454]

Feature description or problem with existing feature
intelphense doesn't recognise the type once mapped using valinor

Describe the solution you'd like

function hello(string $a): void
{
    $blah = (new \CuyZ\Valinor\MapperBuilder())
    ->allowSuperfluousKeys()
    ->allowPermissiveTypes()
    ->mapper()
    ->map('string', \CuyZ\Valinor\Mapper\Source\Source::json($a));

    world($blah);
}

function world(string $b): void
{
}

Additional context
Error shown :

[bmewburn]

I was unable to repro in 1.13 . Is it still a problem?

[momala454]

yes it still occurs in 1.13.1