Mongo BSON objects are not cloneable about deepcopy

[theofidry]

@hackel I don't think DeepCopy should do anything here.

To me (@mnapoli may have a different vision and correct me), there is two use cases for DeepCopy:

• Use to ensure real deep cloning, that might be necessary in libraries like PHPUnit or weird cases where you might have circular references
• A more common userland deep cloning which should not be much more than calling a regular clone, check recursively for arrays or simple do nothing on scalar values

From the error it looks like BSON objects, or at least ObjectID prevents any clone call. There might be a reason to it, but I don't think DeepCopy should implement custom ways of cloning. If you want to do that, I would rather recommend to extend/decorate it instead.

[mnapoli]

👍 to me we shouldn't do anything specific here, you can use filters and matchers to clone ObjectID properly.

[hackel]

Yes, that makes more sense, thanks.