For example, when I call `publishData`, how to specify the way that the data is signed/encrypted?
Do I have to use `Logic` instead of `Socket` for security integration?
Bug submitted to WebKit: https://bugs.webkit.org/show_bug.cgi?id=206898
## Description of the problem
In Safari on macOS & iOS, some glyphs keep a fixed advance width even if `letter-spacing` is…