It should be documented explicitly in the API for fields_base::set that both the key and value are checked for grammatical correctness according to the rfc and that if the field-value contains an obs-fold that it's appropriately replaced with SP which is documented here.
It should be documented explicitly in the API for
fields_base::setthat both the key and value are checked for grammatical correctness according to the rfc and that if thefield-valuecontains anobs-foldthat it's appropriately replaced with SP which is documented here.