Large vertical lines in braket notation are too thick when using Asana Math

Question

For creating braket notation within my formulas, I tried using the following two approaches:

• https://tex.stackexchange.com/a/214730/205359 (Braket package)
• https://tex.stackexchange.com/a/214825/205359 (Mathtools approach)

Although, when using the math font "Asana Math" and XeTeX, the following happens to larger braket formulas:

As you can see, the vertical lines are abnormally thick. Is there a way to prevent that from happening?

MWE:

\documentclass[a4paper]{scrartcl}
\usepackage[ngerman]{babel}

\usepackage{fontspec}
\usepackage{unicode-math}
\setmathfont[Style=Alternate]{Asana Math}

\usepackage{mathtools}
\DeclarePairedDelimiter\bra{\langle}{\rvert}
\DeclarePairedDelimiter\ket{\lvert}{\rangle}
\DeclarePairedDelimiterX\braket[2]{\langle}{\rangle}{#1 \delimsize\vert #2}
\DeclarePairedDelimiterX\braketdouble[3]{\langle}{\rangle}{#1 \delimsize\lvert #2 \delimsize\rvert #3}

\begin{document}
\begin{align*}
\braketdouble*{\psi }{ {\sum_i{\ket{i}\bra{i}}} }{ \psi}
\end{align*}
\end{document}

Answer 1

You can borrow \vert from another font.

\documentclass[a4paper]{scrartcl}
\usepackage[ngerman]{babel}

\usepackage{fontspec}
\usepackage{unicode-math}
\setmathfont[Style=Alternate]{Asana Math}
\setmathfont[range=\vert]{STIX Two Math}
\setmathfont[range=]{Asana Math}

\usepackage{mathtools}

\DeclarePairedDelimiter\bra{\langle}{\rvert}
\DeclarePairedDelimiter\ket{\lvert}{\rangle}
\DeclarePairedDelimiterX\braket[2]{\langle}{\rangle}{#1 \,\delimsize\vert\, #2}
\DeclarePairedDelimiterX\braketdouble[3]{\langle}{\rangle}{%
  #1 \,\delimsize\vert\, #2 \,\delimsize\vert\, #3%
}

\begin{document}

\begin{equation*}
\braketdouble[\bigg]{\psi }{ {\sum_i{\ket{i}\bra{i}}} }{ \psi}
\end{equation*}

\end{document}

I wouldn't use * in this case, that makes too big fences.

Answer 2

The font just has very wide | extension parts specified, but you could use a rule instead

\documentclass[a4paper]{scrartcl}
\usepackage[ngerman]{babel}

\usepackage{mathtools}
\usepackage{fontspec}
\usepackage{unicode-math}
\setmathfont[Style=Alternate]{Asana Math}


\DeclarePairedDelimiter\bra{\langle}{\rvert}
\DeclarePairedDelimiter\ket{\lvert}{\rangle}
\DeclarePairedDelimiterX\braket[2]{\langle}{\rangle}{#1 \delimsize\vert #2}
\DeclarePairedDelimiterX\braketdouble[3]{\langle}{\rangle}{#1 \delimsize\lvert #2 \delimsize\rvert #3}

\begin{document}

\[
\braketdouble*{\psi }{ {\sum_i{\ket{i}\bra{i}}} }{ \psi}
\]
\[
\Uleft<\psi\vline width .9pt \sum_i \lvert i\rangle\langle  i\rvert \vline width .9pt \psi\Uright>
\]
\end{document}