LGTM.com - false positive - Invalid character

[henrythasler]

Variable names cos2σₘ, λʹ and σʹ not recognized.
Error message is Error: Invalid character.

It should be valid according to JavaScript variable name validator: cos2σₘ, λʹ and σʹ

see: https://lgtm.com/projects/g/henrythasler/Leaflet.Geodesic/snapshot/e5e54bbb670a76e9fc1f549c9c4dfcbc1551d28c/files/src/geodesic-core.ts#x17254ea384a69cbc:1