code: function defaultCompression (compression) {
      // set binaryIds
      if (defined(compression)) {
          getGlobal().defaultCompression = !!compression
          // return class when setting
          return ImmutableCoreModel
      }
      // return default compression
      return getGlobal().defaultCompression
  }
docs: @function defaultCompression
  
  get/set global default for compression setting
  
  @param {boolean|undefined} binaryIds
  
  @returns {ImmutableCoreModel|boolean}