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library(RJSONIO)toJSON(list(1, 2, list(1, NA)))toJSON(list(1, 2, list(NA))) # collapses the sub-list into the main vector.e = new.env(); e$a = 1:10; e$bc = letters[1:3]cat(toJSON(e, pretty = TRUE))a = list(x=1, y=character(0))fromJSON( toJSON( a ) )a = list(x=1, y=character(0), b = 1)fromJSON( toJSON( a ) )a = list(x = vector(), y = 123, z = "allo")fromJSON(toJSON(a))