Add AbsoluteEdge

[Dark-Existed]

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[Kyle-Ye]

Thanks for your contribution.

Notice a few things here:

1. AbsoluteEdge should be package instead of public
2. No test case coverage.

If you want to contribute to this project, I suggest starting from searching and fixing the FIXMEs in the codebase or improving the test case coverage which would more likely to be merged.

Close in favor of #155