GoFSH does not escape quotes in code definitions

[cmoesel]

GoFSH properly escapes quotes in some, but not all, circumstances. For example, given this CodeSystem:

{
  "resourceType": "CodeSystem",
  "status": "active",
  "content": "complete",
  "name": "MyCodeSystem",
  "id": "MyCodeSystem",
  "version": "0.1.0",
  "url": "http://example.org/CodeSystem/MyCodeSystem",
  "concept": [
    {
      "code": "foo",
      "display": "Foo",
      "definition": "The \"Foo\" system"
    }
  ],
  "count": 1
}

GoFSH produces this FSH:

CodeSystem: MyCodeSystem
Id: MyCodeSystem
* ^status = #active
* ^content = #complete
* ^version = "0.1.0"
* ^count = 1
* #foo "Foo" "The "Foo" system"

Note that the definition should be "The \"Foo\" system". I'm not sure, but I think maybe this is actually happening somewhere in one of SUSHI's toFSH() functions?