ReadonlybindingBinding number, matching the layout's.
ReadonlyresourceThe bound resource: a buffer range, a texture view, or a sampler.
Typed as two constituents though the prose names three, because
GpuTextureView and GpuSampler are both opaque object
aliases on this surface — naming both would duplicate one union
constituent — and it is the matching layout entry, never the handle's
shape, that tells WebGPU which kind it received.
A bound resource: a buffer range, a texture view, or a sampler.