library(RJSONIO)
i = fromJSON("[123]")[[1]]
is.integer(i)
i == 123L
x = fromJSON("[12345678901]")[[1]]
is.numeric(x[[1]])
x == 12345678901
x = fromJSON("[-12345678901]")[[1]]
is.numeric(x[[1]])
x == -12345678901
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