"unordered_set(..., [bck], [hsh], [keq], [alc])" should read
"unordered_set{..., [bck], [hsh], [keq], [alc]}"
In the top row of the table on p. 445, under Operation, it says "unordered_set(..., [bck], [hsh], [keq], [alc])" (so parentheses are used), but the Notes column says, "Performs braced initialization of a newly constructed unordered set" (emphasis added)
"unordered_set(..., [bck], [hsh], [keq], [alc])" should read
"unordered_set{..., [bck], [hsh], [keq], [alc]}"
In the top row of the table on p. 445, under Operation, it says "unordered_set(..., [bck], [hsh], [keq], [alc])" (so parentheses are used), but the Notes column says, "Performs braced initialization of a newly constructed unordered set" (emphasis added)