I want to make a table with rules that are thicker than the default. It's pretty straightforward to do, however the result looks bad: the lines have gaps in them (see image below). There must be a way to make this look better.
\documentclass{article}
\setlength{\arrayrulewidth}{2pt}
\begin{document}
\begin{tabular}{|c|c|}
\hline
hello & world \cr
\hline
hello & world \cr
\hline
\end{tabular}
\end{document}

