Need Optional parameter for Keypoint class as we have one for BoundingBox

In case, we want to track the Keypoint transformations and pickout the labels which we want to use, It would be useful if we add label parameter.

As of now, we can do something like the below code in BB's :
`ia.BoundingBox(
x

An extra null pointer check is not needed in functions like the following.

• LEdge
• [Range_tree_1](https://githu

It would be nice to have a shortcut for "Map It!" button to speed-up the experiments with WKT. Ctrl+enter and Shift+enter when the input is focused seem to be a reasonable choice for this!

Leaflet is listed as an external dependency in the rollup config, but it appears to still be bundled in the dist files.

Thanx a lot for you lib
Please can you give a small example of using it without node.js
We have "snake" track and we need to calculate interselections and show it.
is anyone hase the same task ?

find . -iname '*.py' | grep -vE 'example|docs' | xargs -P 4 -I{} python3.8 -Wall -m py_compile {}
./tests/test_pyclipper.py:276: SyntaxWarning: "is" with a literal. Did you mean "=="?
  self.assertTrue(len(node.Contour) is 0 or len(node.Contour) > 2)

I'm a Rust n00b but I have 25+ years of experience working with geometry in C/C++ (e.g. using libs like OpenMesh). The reference docs for Plexus are extremely thin even for someone like me. I.e. I have to do a lot of trial and error when using this crate.

It would really be helpful if there were some more examples. Maybe some code that shows how to convert an indexed mesh, loaded e.g. from an O