code: function isRevalidatingCacheKey (ctx, currentEntryKey) {
    const revalidatingCache = ctx.locals.revalidatingCache
    return (revalidatingCache && revalidatingCache.entryKey) === currentEntryKey
  }
docs: Checks if the current entry key is the one being revalidated
  @param {DataPoint.Accumulator} ctx DataPoint Accumulator object
  @param {String} currentEntryKey entry key
  @returns {Boolean} true if revalidating entryKey matches current key