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I discussed it with Andrzej Krzemienski and I suggested this rewording:
Specifically, optional<T> has a constructor with in_place_t as the
first argument followed by a function parameter pack; this indicates
that T should be constructed in-place (as if by a call to placement
new expression) with the pack expansion forming the constructor
arguments.
He pointed out that "argument pack" is also used (without definition) in [temp.arg]/4
Closed by 0131a03. I in fact removed the sentence outright as it adds nothing to the existing normative wording for the constructors disambiguated by in_place_t.
Alisdair says:
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