qs saves include extra items in environments about qs HOT 3 CLOSED

Hi @kendonB , the issue is not environment, but junk <- 1:1e+08 being an ALT-REP, which is a special type of object. Let me explain, but first try this:

normal_lm <- function(){
  set.seed(1); junk <- runif(1e7) # <---- change from your original code
  lm(Sepal.Length ~ Sepal.Width, data = iris)
}

normal_ggplot <- function(){
  set.seed(1); junk <- runif(1e7)
  ggplot2::ggplot()
}

clean_lm <- function () {
  set.seed(1); junk <- runif(1e7) 
  # Run the lm in its own environment
  env <- new.env(parent = globalenv())
  env$subset <- subset
  with(env, lm(Sepal.Length ~ Sepal.Width, data = iris))
}

save_size_qs(normal_lm())
#> [1] 41807225
save_size_rds(normal_lm())
#> [1] 53264446

You can see that for other types of objects, the compressed sizes are similar. In R 3.6, rds uses a new format that serializes ALT-REP objects in a different way. Effectively, rds only saves the 1 and 1e8 in 1:1e8.

I could do this with qs, but it'll take some work and I don't view this as a high priority, since the compression of 1:1e8 is already quite efficient. 1:1e8 is ~400 Mb expanded in memeory, and qs compresses that down to 800 Kb.

In general, an object like 1:1e8 is also not something I think is worth serializing since it's really a number series and not data.

from qs.

@wlandau fyi

from qs.

Possibly related: #21

from qs.