public struct Group: NodeRepresentable {
  @usableFromInline
  let node: any NodeRepresentable

  @usableFromInline
  init(
    separator: AnyNode,
    node: any NodeRepresentable
  ) {
    if let many = node as? _ManyNode {
      self.node = _ManyNode(many.nodes, separator: separator)
    } else {
      self.node = node
    }
  }

  @inlinable
  public init(
    separator: any NodeRepresentable,
    @NodeBuilder _ build: () -> any NodeRepresentable
  ) {
    self.init(separator: separator.eraseToAnyNode(), node: build())
  }

  @inlinable
  public init(
    separator: String = " ",
    @NodeBuilder _ build: () -> any NodeRepresentable
  ) {
    self.init(separator: separator.eraseToAnyNode(), node: build())
  }

  @inlinable
  public func render() -> String {
    node.render()
  }
}