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Apart from "SEED" records, all values in save files generated by Puzzles should be printable ASCII. This is enforced by assertion in the saving code. However, if a save file with non-ASCII move strings (for instance) manages to get loaded then these non-ASCII values can cause an assertion failure on saving. Instead, the loading code now checks values for ASCIIness. This will not only avoid problems when re-saving files, but will also defend the various internal parsers from at least some evil strings. It shouldn't invalidate any save files actually generated by Puzzles, but it will sadly invalidate some of my fuzzing corpus.
This is the README accompanying the source code to Simon Tatham's puzzle collection. The collection's web site is at <https://www.chiark.greenend.org.uk/~sgtatham/puzzles/>. The puzzle collection is built using CMake <https://cmake.org/>. To compile in the simplest way (on any of Linux, Windows or Mac), run these commands in the source directory: cmake . cmake --build . The manual is provided in Windows Help format for the Windows build; in text format for anyone who needs it; and in HTML for the Mac OS X application and for the web site. It is generated from a Halibut source file (puzzles.but), which is the preferred form for modification. To generate the manual in other formats, rebuild it, or learn about Halibut, visit the Halibut website at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.