## numeric and NULL
glu_num <- c(1, 2, 3)
ins_num <- c(2, 3, 4, 5)
bw_null <- NULL
## not numeric nor NULL
glu_chr <- c(1, 2, 3, "a", "b")
ins_chr <- c("1", 2, 3, 4, 5)
bw_chr <- c("NULL", NULL)
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