curveVertex() with endshape(CLOSE) does not close with a curve

[bmoren]

Nature of issue?

• [x] Found a bug
• [ ] Existing feature enhancement
• [x] New feature request

Most appropriate sub-area of p5.js?

• [ ] Color
• [x] Core/Environment/Rendering
• [ ] Data
• [ ] Events
• [ ] Image
• [ ] IO
• [ ] Math
• [ ] Typography
• [ ] Utilities
• [ ] WebGL
• [ ] Other (specify if possible)

Which platform were you using when you encountered this?

• [ ] Mobile/Tablet (touch devices)
• [x] Desktop/Laptop
• [ ] Others (specify if possible)

Details about the bug:

• p5.js version: 0.7.2
• Web browser and version: Firefox: Version 62.0
• Operating System: MacOSX
• Steps to reproduce this:

function draw() {
  curvyPolygon(6, 100,100, 50)
}


function curvyPolygon( n, xPOS, yPOS, r) {
  let angle = 360.0 / n;

  beginShape();
  for (let i = 0; i < n; i++) {
    curveVertex(xPOS + r  * cos(radians(angle * i)),
      yPOS + r   * sin(radians(angle * i)));
  }

  endShape(CLOSE);

}

When utilizing curveVertex() with endshape(CLOSE), the behavior is to draw a straight line to the close the shape. My expected behavior would be to have a curve complete the shape. Does anyone else feel this way? is this something that should be addressed? This has also been mentioned in #408