The original JSON-LD image uses an obscure font. This causes rendering issues, as most systems will not display the correct font, causing the braces to be misaligned with the symbol. Unfortunately, it undoes most of the savings from the previous commit.
The original logo file had a number of small issues, many of which were preserved to the tiny version. The savings come from fixing those issues, removing extra nodes, and using <use>s for the highlights rather than one large path.
