"duplicated" method for Crunch objects
duplicated(x, incomparables = FALSE, ...)
# S4 method for class 'CrunchVariable'
duplicated(x, incomparables = FALSE, ...)
# S4 method for class 'CrunchExpr'
duplicated(x, incomparables = FALSE, ...)
A CrunchLogicalExpr
that evaluates TRUE
for all repeated
entries after the first occurrence of a value.