React Error boundary does

Trying to understand why throwing Error does not work with Error Boundary

HTML

<div id="app"></div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

li {
  margin: 8px 0;
}

h2 {
  font-weight: bold;
  margin-bottom: 15px;
}

.done {
  color: rgba(0, 0, 0, 0.3);
  text-decoration: line-through;
}

input {
  margin-right: 5px;
}

React

class Boundary extends React.Component {
	constructor() {
  super();
  this.state = {}
  }
componentDidCatch(error, info) {
  	this.setState({
    error,
    info,
    })
  }
  
  render() {
  if (this.state.error) {
     return (
     <div>
       {JSON.stringify(this.state)}
     </div>)
  }
  return this.props.children;
  }
}

class Component extends React.Component {
 	render() {
  // Why and what should i do ?
  throw 'This error will be available'
  throw new Error('This will not be available');
  }
}

class TodoApp extends React.Component {
  constructor(props) {
    super(props)
  }
  
  render() {
    return (
    <Boundary>
      <div>
        <Component />
      </div>
    </Boundary>
    )
  }
}

ReactDOM.render(<TodoApp />, document.querySelector("#app"))