What is the best way to set tikz arrowheads globally to one style, so that one can use > and < throughout the document (e.g. as \path[<-]) instead of writing \path[latex-] everywhere?
MWE:
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{arrows}
%something here to make both lines in the output look the same
\begin{document}
\tikz \path[->] (0,0) edge (2em,0);
\tikz \path[<-] (0,0) edge (2em,0);
\tikz \path[-latex] (0,0) edge (2em,0);
\tikz \path[latex-] (0,0) edge (2em,0);
\end{document}
