union data not simplify?

[ganluo960214]

p1:
[
    [
        [0,0],
        [1,0],
        [1,1],
        [0,1],
        [0,0],
    ]
],
p2:
[
    [
        [1,0],
        [2,0],
        [2,1],
        [1,1],
        [1,0]
    ]
]
union:
[
  [
    [ 0, 0 ], [ 1, 0 ],
    [ 2, 0 ], [ 2, 1 ],
    [ 1, 1 ], [ 0, 1 ],
    [ 0, 0 ]
  ]
]
union(simplify):
[
  [
    [ 0, 0 ],
    [ 2, 0 ], [ 2, 1 ],
              [ 0, 1 ],
    [ 0, 0 ]
  ]
]

[rowanwins]

Unfortunately it's not really clear what this issue is about

[jmb20]

I think @ganluo960214 asks why the Union operation does not remove vertices that are collinear and on the edges of the union of polygons, i.e., why (1,0) and (1,1) are not removed from the output.