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Map up-cased symbol names to referenced values if those values are string scalars (else throw).
map_upper(...)
map from original symbol names to new names (names found in the current environment)
symbol names mapping to string scalars
let
x <- 'a' print(map_upper(x)) d <- data.frame(a = "a_val") let(map_upper(x), paste(d$X, x))
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