\begin{table}
\centering
\begin{tblr}[         %% tabularray outer open
]                     %% tabularray outer close
{                     %% tabularray inner open
colspec={Q[]Q[]},
}                     %% tabularray inner close
\toprule
num & char \\ \midrule %% TinyTableHeader
3.1 & 10\$ \\
3.14 & blah\_blah \\
\bottomrule
\end{tblr}
\end{table} 
