pgfmath / ifthenelse: Problem mit if-Unterscheidung - Ausgabe seltsamer Werte

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\documentclass[border=5mm, varwidth]{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}[>=latex, font=\footnotesize, x = 0.75cm]
% KoSy
\draw[->] (-8.5,0) -- (8.5,0) node[anchor=north west]{$x$};
\foreach \x in {-8,...,8}
\draw[shift={(\x,0)}] (0,-2pt) -- (0,2pt) node[below=2pt]{\x};
\foreach \b in {0.5, 1.2, 2.1}{%
\pgfmathsetmacro{\Arg}{pi*\b}
\draw[shift={(\Arg,0)}, densely dashed] (0,0) -- (0,6mm) node[above]{$\b\pi$};
%
\pgfmathparse{\Arg > pi ? "ja" : "nein"}
\path[shift={(\Arg,0)}] (0,0) -- (0,10mm) node[anchor=south] {$\pgfmathresult$};
%
}%
\end{tikzpicture}
\end{document}
 
 
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