tikz: grid corners

Question

Apologies if this is a duplicate. It would seem like it would be a well-known problem, but I was unable to track a solution.

In words: the grid lines do not extend enough to form sharp corners. I would like sharp corners. Thanks.

\documentclass[border=1mm]{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}[scale=1]
  \draw (0, 0) grid (1, 1);
\end{tikzpicture}
\end{document}

Answer 1

I do not know why it is not default for grid, but it helps to set the line cap to rect.

\documentclass[border=1mm]{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\draw[line cap=rect] (0, 0) grid (1, 1);
\end{tikzpicture}
\end{document}