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one
Combined from primary sources listed below.

In Any§

See primary documentation in context for routine one. 

method one(        --> Junction:D)
multi  one(+values --> Junction:D)
multi  one(@values --> Junction:D)

Interprets the invocant or arguments as a list and creates a one-Junction from it.

say so 1 == (1, 2, 3).one;      # OUTPUT: «True␤»
say so 1 == one(1, 2, 1);       # OUTPUT: «False␤»