# class_prototype_is.R
#' @title
#' Prototype: test if an object is of class Prototype
#'
#' @description
#' Test if an object is of class [`Prototype`][Prototype-class].
#'
#' @param x conceptually, any \R object.
#'
#' @return
#' A logical of length 1. A `TRUE` implies that `x` is an object of class
#' [`Prototype`][Prototype-class].
#'
#' @family Prototype
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