Re: [PATCH v10 0/8] MR436: vkd3d-shader/dxil: Implement the DXIL CAST instruction.

[Conor McCarthy (＠cmccarthy)]

I realised while preparing the `vselect` MR that we are missing validation of the source value type (function/register/handle) here and probably elsewhere. At this late stage I think it should go in a separate MR instead of revising this.