R version 4.5.0 RC (2025-04-03 r88103 ucrt) -- "How About a Twenty-Six"
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Platform: x86_64-w64-mingw32/x64

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> library(RJSONIO)
> 
> stopifnot(is.list(fromJSON('[1, "2.3", "abc"]', simplify = Strict)))
> 
> stopifnot(is.character(fromJSON('[1, "2.3", "abc"]', simplify = TRUE)))
> 
> stopifnot(is.character(fromJSON('[1, true, "2.3", "abc"]', simplify = TRUE)))
> 
> stopifnot(is.list(fromJSON('[1, true, "2.3", "abc"]', simplify = Strict)))
> 
> stopifnot(is.list(fromJSON('[1, true]', simplify = Strict)))
> stopifnot(is.numeric(fromJSON('[1, true]', simplify = TRUE)))
> 
> stopifnot(is.character(fromJSON('["1", true]', simplify = TRUE)))
> 
> 
> stopifnot(is.character(fromJSON('{ "a": "1", "b": true}', simplify = TRUE)))
> stopifnot(is.list(fromJSON('{ "a": "1", "b": true}', simplify = Strict)))
> 
> stopifnot(is.character(fromJSON('{ "a": "1", "b": "true"}', simplify = Strict)))
> 
> stopifnot(is.numeric(fromJSON('{ "a": 1, "b": 2}', simplify = Strict)))
> 
> stopifnot(is.list(fromJSON('{ "a": 1, "b": 2}', simplify = FALSE)))
> 
> 
> is.na(fromJSON(toJSON( c("a", NA, "b", "c")), nullValue = NA, simplify = TRUE))
[1] FALSE  TRUE FALSE FALSE
> is.na(fromJSON(toJSON( c(1, NA, 3, 4)), nullValue = NA, simplify = TRUE))
[1] FALSE  TRUE FALSE FALSE
> 
> is.na(fromJSON(toJSON( c(TRUE, NA, FALSE, TRUE)), nullValue = NA, simplify = TRUE))
[1] FALSE  TRUE FALSE FALSE
> 
> 
> 
> 
> proc.time()
   user  system elapsed 
   0.15    0.01    0.15