1. Why is there !!@current_scope on line 33 of the generated code? What is this accomplishing?
2. Why is there a :let={f} on line 26? I see that is accessed on line 34, but I don’t understand why we can’t just use @form here and avoid the let?

For context here is are lines 25-44 of the generated login page:

        <.form
          :let={f} #why the let binding?
          for={@form}
          id="login_form_magic"
          action={~p"/users/log-in"}
          phx-submit="submit_magic"
        >
          <.input
            readonly={!!@current_scope} #why the double negation?
            field={f[:email]}
            type="email"
            label="Email"
            autocomplete="username"
            required
            phx-mounted={JS.focus()}
          />
          <.button class="w-full" variant="primary">
            Log in with email <span aria-hidden="true">→</span>
          </.button>
        </.form>

This pattern is repeated for the second form for logging in with email and password. I’ve searched through the Phoenix documentation and I haven’t found anything helpful. I’ll admit I don’t grok the :letspecial attribute 100% so maybe that is the source of my confusion.