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LuaTeX 1.07 2018-01-17

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(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