Check if an object is a waiver.
Examples
# create new waiver object
w <- new_waiver()
# is it a waiver object?
is.Waiver(w)
#> [1] TRUE
Check if an object is a waiver.
# create new waiver object
w <- new_waiver()
# is it a waiver object?
is.Waiver(w)
#> [1] TRUE