How to use TikZ for inline polygons

The trick is to define inner sep=0pt when beginning the tikzpicture environment, as I learned from pgf bug report #172 minimum size in regular polygon fails for small length from last year. Here is a minimum working example, adapted to my use case of inline polygon symbols with roughly text height, i.e. 2ex in my case:


\newcommand{\poly}[2]{\tikz[inner sep=0pt] {%
\node[regular polygon,%
regular polygon sides=#1,%
regular polygon rotate=#2,%
minimum size=2ex, fill] (0,0) {};}}

Triangle upwards \poly{3}{0}, 
triangle downward \poly{3}{180} 
and diamond \poly{4}{45}.

This snippet yields the following result:


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