[Feature Request] Nested coordinate

[38]

What is the feature ?

Nested coordinate, which means it's a discrete coordinate but for each value, it attached another nested coordinate system on that.

(Optional) Why this feature is useful and how people would use the feature ?

While I make the PR for criterion, this idea comes out. Check out the following example for details:

Each of the tick mark has a nested coordinate system ranged from -1.0 to +1.0

(Optional) Additional Information

Blockers: This would be blocked by this issue #80 . Unless we have a reasonable abstraction on discrete coordinate, this is tricky to accomplish.

[38]

PR #105