The wording change from Permissible to Possible and making it non-normative was an attempt to clarify that the list of behaviors that follows is a false range and not an exhaustive list.
It's a submarine change because in the eyes of the committee, this is not a change, merely a clarification of what it already said, to guard against ongoing misinterpretation.
Comments
Expressio unius est exclusio alterius.
This construction is called a "false range" in English.
https://www.chicagomanualofstyle.org/qanda/data/faq/topics/C... https://www.cjr.org/language_corner/out_of_range.php
The wording change from Permissible to Possible and making it non-normative was an attempt to clarify that the list of behaviors that follows is a false range and not an exhaustive list.
It's a submarine change because in the eyes of the committee, this is not a change, merely a clarification of what it already said, to guard against ongoing misinterpretation.