In beamer, is there a way to change an attribute of a tikz node with a `\pause`?

I got a node which is initially a circle.
I wish to change this to a rectangle after a `\pause`.

This was the example that I had in mind:

```
\documentclass{beamer}
\usepackage{tikz}
\begin{document}

\begin{frame}{Hi}
  \begin{tikzpicture}
    \only<1>{
      \node[circle, fill] (hi) {Hi};
    }
    \only<2>{
      \node[rectangle, fill] (hi2) {Hi};
    }
  \end{tikzpicture}
\end{frame}

\end{document}
```

How can this be done? Preferably without too much code duplication.

Can aobs-tikz package be of help here?

The above snippet is what I thought was a minimal example.
What I really wanted involved the automata tikz library, where I wanted to remove `accepting` attribute from a node.

Edit: an example with automata library

```
\documentclass{beamer}
\usepackage{tikz}
\usetikzlibrary{automata}
\usetikzlibrary{overlay-beamer-styles}
\begin{document}

\begin{frame}{Hi}
  \begin{tikzpicture}
    \node[alt=<2,3>{}{accepting}, state] (a) {A};
  \end{tikzpicture}
\end{frame}

\end{document}
```