 
   @inline(__always)
   fileprivate var _capacityAndFlags: _CapacityAndFlags {
-    // TODO: ...
     _CapacityAndFlags(realCapacity: _realCapacity, flags: _capacityFlags)
   }
 #else


// Creation
extension __StringStorage {
  // TODO: Test effect of asking for exactly 62, 63, 64, 65 code units...
  @_effects(releasenone)
  private static func create(
    codeUnitCapacity capacity: Int, countAndFlags: _CountAndFlags

    // initialized so we can't verify e.g. ASCII-ness
    storage._invariantCheck(initialized: false)
    return storage
  }

  // The caller is expected to check UTF8 validity and ASCII-ness and update
