This evening's #macdev SF Symbols fun: building integration tests that confirm my app's canvas rendering, my preview pipeline (auto-generate a .caf file, load it with NSBundle), and a full actool/asset catalog workflow, all result in identical rendering of a symbol.

Fun includes: trying to work out the size ratio between TextKit's underline and strike through. Work out how the phase of dashed lines is calculated in Core Graphics. And a LOT of baseline calculations.