9.81.1 Top new questions this week

9.81.1.1 What is \directlua0   vs \directlua

https://tex.stackexchange.com/landing/r/digest?cta=question&id=702542

The title is the question. According to the LuaTeX manual, command \directlua{code} may have a 16-bit number between the command and the code, and I have seen \directlua0{code} here and there. But I ... 
[luatex] [directlua]
 

asked by rallg https://tex.stackexchange.com/landing/r/digest?cta=user&id=287367 Score of 10

answered by Marcel KrA~\274ger https://tex.stackexchange.com/landing/r/digest?cta=user&id=80496 Score of 8

9.81.1.2 ExPex fails with unicode-math. How to avoid the clash?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=703094

The following code fails: 
\documentclass{article} 
\usepackage{expex} 
\usepackage{unicode-math}% Works without this 
\begin{document} 
\pex<ex> 
\a<foo>\begingl 
\gla  foo// 
\glb  foo// 
\glft ... 
[unicode-math] [input-encodings] [linguistics] [expex]
 

asked by Niranjan https://tex.stackexchange.com/landing/r/digest?cta=user&id=174620 Score of 7

answered by egreg https://tex.stackexchange.com/landing/r/digest?cta=user&id=4427 Score of 4

9.81.1.3 How to handle URLs with TeX-special charactors in a footnote

https://tex.stackexchange.com/landing/r/digest?cta=question&id=702915

When I add a URL with TeX-special charactersa^\200\224such as % in the example belowa^\200\224to a footnote, it does not work. 
\documentclass{article} 
\usepackage{hyperref} 
\usepackage{xurl} 
\begin{document} 
1\... 
[footnotes] [urls]
 

asked by Dolphin https://tex.stackexchange.com/landing/r/digest?cta=user&id=69600 Score of 7

answered by Mico https://tex.stackexchange.com/landing/r/digest?cta=user&id=5001 Score of 8

9.81.1.4 Where do primitives for drawing come from?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=702906

I'm currently wondering how packages like tikz can possibly work. I've read the TeX Book and found no evidence of TeX primitives capable of drawing things. LaTeX is just a collection of macros so the ... 
[pdftex] [tex-core] [primitives]
 

asked by HomoVafer https://tex.stackexchange.com/landing/r/digest?cta=user&id=246101 Score of 7

answered by campa https://tex.stackexchange.com/landing/r/digest?cta=user&id=82917 Score of 2

9.81.1.5 How to determine if a symbol / command is a relation?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=702635

I am using \sim as a binary operator and was wondering which of the following two was correct: 
\documentclass{article} 
\begin{document} 
\[a \sim b\] 
\[a \mathrel{\sim} b\] 
\end{document} 
... 
[math-mode] [spacing]
 

asked by ClA~(c)ment https://tex.stackexchange.com/landing/r/digest?cta=user&id=34551 Score of 6

answered by egreg https://tex.stackexchange.com/landing/r/digest?cta=user&id=4427 Score of 10

9.81.1.6 Lua equivalent for `\iffontchar`

https://tex.stackexchange.com/landing/r/digest?cta=question&id=703102

I am looking to replace the TeX command \iffontchar with Lua code. Reason I am printing some tables with Lua code and want to replace the notdef(tofu) with something else. 
\documentclass{article} 
\... 
[lua]
                                                                                  

                                                                                  
 

asked by Yiannis Lazarides https://tex.stackexchange.com/landing/r/digest?cta=user&id=963 Score of 5

9.81.1.7 Get rid of extra white space inserted when using \verb with tabularx

https://tex.stackexchange.com/landing/r/digest?cta=question&id=703034

I noticed a peculiar behavior of tabularx when using \verb. The following minimal working example illustrates the problem. 
Note the wicked extra space introduced between test and {123}. 
\documentclass{... 
[tables] [tabularx] [verbatim]
 

asked by normanius https://tex.stackexchange.com/landing/r/digest?cta=user&id=64217 Score of 5

answered by egreg https://tex.stackexchange.com/landing/r/digest?cta=user&id=4427 Score of 7