[CollectionsMarshal ](https://learn.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.collectionsmarshal.getvaluerefornullref?view=net-8.0) now supports GetValueRefOrAddDefault and GetValueRefOrNullRef for Dictionary, which can boost the check or add operations. Plase add GetValueRefOrAddDefault and GetValueRefOrNullRef support for PooledDictionary, thanks.