Constant tectonic_engine_xetex::FORMAT_SERIAL

pub const FORMAT_SERIAL: u32 = 33;

A serial number describing the detailed binary layout of the TeX “format files” used by this crate. This number will occasionally increment, indicating that the format file structure has changed. There is no provision for partial forwards or backwards compatibility: if the number changes, you need to regenerate your format files. If you’re generating format files, you should munge this serial number in the filename, or something along those lines, to make sure that when the engine is updated you don’t attempt to reuse old files.