Thanks, Quinn. This is slightly annoying--I want this in the (nearly) platform-independent computational engine, which we build as a framework for iOS, while the Objective-C is in the GUI application that loads the framework. (The former has moved from MacOS -> MacOSX + iOS and from m68k->PPC->PPC64->x86->x86_64->arm64 with only minor tweaks, while the latter has needed major rewrites to go from MacOS -> Carbon -> Cocoa (AppKit) and a separate rewrite to go to UIKit.) But I'll live...