Sets the cause attribute of an object and returns that object.
set_cause(x, false_value, missing_value = "missing")A variable.
A character vector to set the cause to, where x is
FALSE.
A character vector to set the cause to, where x is
NA.
x, with a new cause attribute.
If x is TRUE everywhere, this returns the input
without setting a cause. Otherwise, the cause is an empty string where
x is TRUE, false_value where it is FALSE, and
missing_value where it is NA.