[Tex/LaTex] Uppercase headings with uppercase numbers

Question

I'm trying to get uppercase section titles with uppercase numbers,
but for some reason \addfontfeature can't be used inside \titleformat.
Why is that and how could I get this to work?

\documentclass{article}
\usepackage{fontspec}
\usepackage{titlesec}

\setmainfont{ebgaramond}

\titleformat{\section}{\filcenter\uppercase}
  {\addfontfeature{Numbers=Lining}\thesection. }{0pt}{}

\begin{document}
\section{Uppercase numbers}
Uppercase letters should be accompanied by uppercase numbers.
\end{document}

>

ERROR: LaTeX error: "kernel/key-unknown"

--- TeX said ---
! 
! The key 'fontspec/NUMBERS' is unknown and is being ignored.
! 
! See the LaTeX3 documentation for further information.
! 
! For immediate help type H <return>.
!...............................................  

l.10 \section{Uppercase numbers}

--- HELP ---
From the .log file...

|'''''''''''''''''''''''''''''''''''''''''''''''
| The module 'fontspec' does not have a key called 'fontspec/NUMBERS'.
| Check that you have spelled the key name correctly.
|...............................................

Answer 1

The simplest way is to define a new font family:

\documentclass{article}
\usepackage{fontspec}
\usepackage{titlesec}

\setmainfont{EB Garamond}
\newfontfamily{\titlefont}{EB Garamond}[Numbers=Lining]

\titleformat{\section}
  {\filcenter\titlefont}
  {\thesection. }
  {0pt}
  {\MakeUppercase}

\begin{document}
\section{Uppercase numbers}
Uppercase letters should be accompanied by uppercase numbers.
\end{document}

Note the right position of \MakeUppercase (not \uppercase) and of the font declaration.