VALS() with populated "unknown string"

[mmann78 () netscape net]

Is there a way to provide the "unknown string" for the val_to_str call made in hf_ registration (ie some derivation of 
the VALS() macro)?   There are many proto_tree_add_[u]int_format[_value] calls that are done strictly to provided an 
"unknown string" for the val_to_str that is different than the default of "Unknown".  If there was such a way, many of 
these calls could be converted to proto_tree_add_item or proto_tree_add_[u]int.

If there isn't such a thing, how easy/hard would it be to implement?

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