path params isn't working for params with "." in the name

[fantapop]

Describe the bug
I'm getting an error from the path-params checker saying that a parameter is unused in the path however its clearly being used. I believe this is because the parameter name includes a ".". According to #1969, there should be no restrictions on characters in the path parameters.

To Reproduce

1. Given this OpenAPI Document: petstore.json and a recommended ruleset.json

2. Run this CLI command: spectral lint petstore.json --ruleset ruleset.json

3. See error

  24:11    error  path-params            Parameter "pet.id" must be used in path "/pets/{pet.id}".      paths./pets/{pet.id}.get.parameters[0]

Expected behavior
I expect there to be no path-params error