[Tex/LaTex] Angle notation for complex numbers in polar form

Question

I am looking for suggestions on how to typeset complex numbers in the modulo-argument form, sometimes called phasor notation. Have already checked Conventions for typesetting complex vectors and vectors with complex components but nobody mentions this in particular. I am explicitly excluding exponential and sine-cosine notations.
My MWE is as follows

\documentclass{article}
\begin{document}
    $z = r \angle \phi$
\end{document}

I think it looks ugly, specially if the angle has many digits, ie

$z = 1.19 \angle -78.2039^{\circ}$

I was thinking of an \angle replacement which maybe would extend the lower segment up to the last digit. What do you think?

EDIT: It looks like the steinmetz package doesn't do a good job with the vertical space if the \phasor{} argument has a \fraction{}{} with parenthesis, see:

\documentclass{article}
\usepackage{steinmetz}

\begin{document}
    Something.
    \[I = I \phase{\left(\frac{A_0}{B_0}\right)}\]
    This line is too close to the upper equation, don't you think?

    \[I = I \phase{\left(\frac{A_0}{B_0}\right)}\]
    Whereas this line is NOT so close to the upper equation.
\end{document}

Strangely, commenting the first line (% Something.) fixes the problem. Is there any way to fix this?

Answer 1

The steinmetz package was written exactly for this.

\documentclass{article}

\usepackage{steinmetz}

\begin{document}

$z = 1.19 \phase{-78.2039^{\circ}}$

\end{document}