Line's getRange() is inconsistent in its handling of whitespace

[rcjsuen]

const lib = require("dockerfile-ast");
const f1 = lib.DockerfileParser.parse("FR\\ ");
const f2 = lib.DockerfileParser.parse("# c ");
console.log(f1.getRange().end.character);
console.log(f2.getRange().end.character);

3
4

They should either both print 3 or both print 4. I think f1 should be printing 4 here as the escape character conveys intent that the content after the escape character is important.