data = data.frame(a=c('a','b','c',NA_character_,'e'),
b=c(1:4,NA_integer_),
c=c('a',NA_character_,'c','d','e'),
d=c(NA_real_,1.2,1.3,1.4,1.5),stringsAsFactors = F)
data = na_standard(data)
class(data[,4])
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