Language extension / "behavior"

[Didier Verna]

  Hello,

Section 1.6 Language Extensions of the standard says this:

A language extension is any documented implementation-defined behavior
of a defined name in this standard that varies from the behavior
described in this standard [...]


It is unclear to me if the term "behavior" could encompass additional
keyword arguments passed to a function or macro. I'm assuming here that
the rest of this section is honored (the additional arguments wouldn't
alter the confirming code, and their presence is not explicitly
prohibited).

WDYT?

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