R version 4.5.0 alpha (2025-03-25 r88054 ucrt)
Copyright (C) 2025 The R Foundation for Statistical Computing
Platform: x86_64-w64-mingw32/x64

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> f = "inst/sampleData/usaPolygons.as"
> 
> # The idea here is to customize the reading by pre-allocating space.
> readArray =
+ function(type, val) {
+ #   if(type)
+ }
> 
> # fromJSON(f, )
> 
> proc.time()
   user  system elapsed 
   0.20    0.07    0.26