The current middleware definition func(ctx huma.Context, next func(huma.Context)) receives the per-request ctx as well as the basically constant next parameter for each request. This makes it cumbersome to use middlewares that require "singleton" initialization (e.g. something using groupcache), because there's no way to access next on a per-registration basis.

I'd propose changing the definition of Middleware to:

type Middleware func(next func(Context)) func(Context)

This would allow stuff like:

huma.Register(api, huma.Operation{
	// ... 
	Middlewares: huma.Middlewares{
		func(next func(huma.Context)) func(huma.Context) {
			// initialize per-operation:
			m := func(ctx huma.Context) {
				// ...
			}
			return func(ctx huma.Context) {
				return m(ctx)
			}
		},
	},
}, someHandler)

WDYT?