How to get a BrepVertex's tolerance?

Scripting
1

Hi
Is there a way to get a BrepVertex’s tolerance in RhinoCommon ?
I see no method or property for that …
Thanks

2

Why do you need this?

3

To be able to store all the data from a Brep, and then use that data to rebuild the same object.

4

Any reason not to use the OpenNurbs brep (de)serializer code available via RhinoCommon?

5

That way we would obtain 3dm binary data, right ?