============================================================== LuaTeX 1.07 2018-01-17 ============================================================== (1) This release brings Lua 5.3 to LuaTeX. We have tested an experimental version for a few months and not encountered issues. (2) If you use Lua 5.3 you should be aware of a few changes in the language and its implementation. Numbers are now either integers or floats but are cast automatically. (3) In some cases (e.g. string.format) there is a more strict check. A float always has a decimal appended when serialized, so 1 becomes 1.0 as string. (4) We keep supporting the bit32 library on top of the new bit operators. Be aware of the fact that currently LuajitTeX does not have these operators. (5) Performance of LuaTeX with Lua 5.3 can be slightly better than with 5.2 but this really depends on your usage of Lua. In practice there should be no slowdown. (6) We are aware of possible substantial slowdown of string.format depending on the platform and compiler. This depends on Lua too and will be resolved in due time. (7) If you want to test with Lua 5.3 then have to build LuaTeX with --lua53. Because ConTeXt will switch to 5.3 after this release there will be binaries available at the ConTeXt garden. (8) The 2018 TeXlive distribution will ship with LuaTeX using Lua 5.2 but there will likely be an additional binary LuaTeX53 available. (9) From 2019 TeXlive will ship with LuaTeX and Lua 5.3 as default. We provide --lua52 as build flag for a while. By then we might be looking at Lua 5.4 already. (10) There are the usual patches and cleanups and a few small additions (mentioned in the manual) but there have been no fundamental changes in the API (apart from removing depricated and undocumented functionality). The LuaTeX team