Underline text with === (SETEX style)

Question

I'm trying to recreate the typewriter look.
How to make underline{sometext} work like SETEX-style section marker?
The intended use is with monospaced/typewriter fonts for lines with plenty of space beneath them (like section headings).
Illustration of desired effect below.

wipet · Accepted Answer

For example using halign and leaders primitives:
defunderlined#1{vtop{tthalign{##cr#1crleadershbox{=}hfillcr}}}

Text: underlined{Odwolanie upowaznienia}

bye

DG' · Answer

The real typewriter look can be achieved by setting a number of = below the title. Here is an example with section:
documentclass{article}

usepackage{xstring}
usepackage{multido}
usepackage[explicit]{titlesec}
usepackage[default]{sourcecodepro}

newcommandsetex[1]
  {#1  StrLen{#1}[len]multido{}{len}{=}}

titleformat{section}
  {normalfontfilcenter}{}{0pt}{setex{#1}}

begin{document}

section{Test}

Lorem ipsum...

end{document}

This will not work for really long section titles.

Underline text with === (SETEX style)

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