Why does a badge's font face not correspond to the Shields Specification

[pavpen]

The Shields Specification currently says:

The letter spacing (or kerning) is deliberate and focused on clarity, so is the use of the Open Sans font face. Contrary to widely available web-safe alternative sans-serif fonts like Arial (a sloppy Helvetica ripoff) and Verdana (a sloppy Futura ripoff), Open Sans remains highly legible at very small sizes which is why it was chosen.

However, if I request a badge from Shields.io I currently get the following font stack:

font-family="Verdana,Geneva,DejaVu Sans,sans-serif"

Can someone, please, explain why the Shields.io output doesn't match the specification?

Steps to Reproduce

• curl https://img.shields.io/badge/downloads-2.7G-green

Observed Behavior

• The returned SVG document uses font-family="Verdana,Geneva,DejaVu Sans,sans-serif" for badge labels.

<svg xmlns="http://www.w3.org/2000/svg" width="106" height="20" role="img" aria-label="downloads: 2.7G"><title>downloads: 2.7G</title><filter id="blur"><feGaussianBlur in="SourceGraphic" stdDeviation="16"/></filter><linearGradient id="s" x2="0" y2="100%"><stop offset="0" stop-color="#bbb" stop-opacity=".1"/><stop offset="1" stop-opacity=".1"/></linearGradient><clipPath id="r"><rect width="106" height="20" rx="3" fill="#fff"/></clipPath><g clip-path="url(#r)"><rect width="69" height="20" fill="#555"/><rect x="69" width="37" height="20" fill="#67ac09"/><rect width="106" height="20" fill="url(#s)"/></g><g fill="#fff" text-anchor="middle" font-family="Verdana,Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="110"><text aria-hidden="true" x="355" y="150" fill="#010101" fill-opacity=".80" filter="url(#blur)" transform="scale(.1)" textLength="590">downloads</text><text aria-hidden="true" x="355" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="590">downloads</text><text x="355" y="140" transform="scale(.1)" fill="#fff" textLength="590">downloads</text><text aria-hidden="true" x="865" y="150" fill="#010101" fill-opacity=".80" filter="url(#blur)" transform="scale(.1)" textLength="270">2.7G</text><text aria-hidden="true" x="865" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="270">2.7G</text><text x="865" y="140" transform="scale(.1)" fill="#fff" textLength="270">2.7G</text></g></svg>

Expected Behavior

• The returned SVG uses the "Open Sans" type face.