Lat Long unexpected token, if negative

[CriticalPoint]

In my example I was able to reproduce the error if LAT/LONG had a negative value.

city.findPaths({
  from: { lat: 51.672418464577476, -1.2798756107512863 }
})

Here is a screenshot of the unexpected token - https://i.ibb.co/mCGTKjR/Negative-LAT-LONG.png

I wonder if this is because of the position on the planet, or if I've done something wrong! [I hope it's not my stupidity!]

[CriticalPoint]

Surely Seattle is west meridian (also negative), so now I've said this out loud I'm starting to think that I'm doing this wrong!