Nothing
# issue spotted by Alexandre Sieira
# and his example code.
library(RJSONIO)
fromJSON("[ 1, null, 4 ]", asText = TRUE, simplify = TRUE)
fromJSON('[ "a", null, "d" ]', asText = TRUE, simplify = TRUE)
fromJSON("[ 1, null, 4 ]", asText = TRUE, simplify = TRUE, nullValue = -999L)
fromJSON('[ "a", null, "d" ]', asText = TRUE, simplify = TRUE, nullValue = "999")
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