A range of tags for private use

[dynaxis]

I'm currently designing an inter-process method invocation system, where CBOR will be the main message encoding. I need to tag references to remote objects in the messages, but it seems silly to get a tag assigned in https://docs.google.com/spreadsheets/d/1UajnKeIx_piJsAGRz5YJprvfwrBUeSVykqwG_JQL9rk/edit?usp=sharing. Since the tag for object references will only be used in my system, it seems a waste of the tag code space if I try to register my tag in the IANA registry.

In the case like mine, I think it's a common practice to reserve a range of tag values for private use. I think I might write a spec and reserve a range of tag values from the registry, but it's better to have it specified in the main CBOR spec, IMHO.

What do you think?