It return me only start and end

[francescofact]

Hello,
i tried to implement this project in one of mine website project but i have an issue.
i pass to the function simplify an array like:

Array(
array( "x": ... , "y": ... ),
array( "x": ... , "y": ... ),
array( "x": ... , "y": ... ),
array( "x": ... , "y": ... ),
);

but i will always return me an array of two point, the start point and the end point. What's the problem? I tried with different tollerances and highquality on true/false