\begin{table}
\centering
\begin{tblr}[         %% tabularray outer open
]                     %% tabularray outer close
{                     %% tabularray inner open
colspec={Q[]},
column{1}={si={table-format=-6.5,table-align-text-before=false,table-align-text-after=false,input-symbols={-,\*+()}},},
row{1}={guard},
}                     %% tabularray inner close
\toprule
pi \\ \midrule %% TinyTableHeader
314.15927 \\
3141.5927 \\
31415.927 \\
314159.27 \\
\bottomrule
\end{tblr}
\end{table} 
