Change default <> arrow head separate from >

Question

I can change the default arrow head via \tikzset{>=Latex}. However, it is not a given that the combination of an arrow head and its reverse looks good, so I would like to also change <> to something custom.

I have, on a hunch, tried \tikzset{<>={Diamond[scale=1.2]}} but that doesn't seem like the right syntax. Is there a way to set a default arrow head for <> endings?

Answer 1

You can define the <> arrow tip via the .tip handler (cf. section 16.4.4 "Defining Shorthands", pgfmanual):

\documentclass[tikz,margin=2mm]{standalone}
\usetikzlibrary{arrows.meta}
\begin{document}
\begin{tikzpicture}
  \tikzset{
    >={Latex[]},
    <>/.tip={Diamond[scale=1.2]},
  }
  \draw[dashed,->] (0,0) -- (5,0);
  \draw[-<>] (0,2) -- (5,2);
\end{tikzpicture}
\end{document}

Answer 2

You should create a style with tikzset

\documentclass[tikz,border=3.14mm]{standalone}
\usetikzlibrary{arrows.meta}
\begin{document}
    \begin{tikzpicture}
        \tikzset{myarr/.style={{Diamond[scale=1.2]}-{Diamond[scale=1.2]}}}
        \draw[myarr] (0,0) -- (1,1);
    \end{tikzpicture}
\end{document}