# All list elements are integers with length >= 1?
qtestr(as.list(1:10), "i+")
# All list elements (i.e. data frame columns) are numeric?
qtestr(iris, "n")
# All list elements are numeric, w/o NAs?
qtestr(list(a = 1:3, b = rnorm(1), c = letters), "N+")
# All list elements are numeric OR character
qtestr(list(a = 1:3, b = rnorm(1), c = letters), c("N+", "S+"))
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