Can non-dynamic dependencies of dynamic targets be saved with special data formats?

[psadil]

Prework

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Hello!

Description

Is there a special way to mix the format = ... option with dynamic targets? In the example below, I'm getting an error when a dependency (numbers) of a dynamic target (again) is stored with format = "qs", but only when the dependency is not itself a dynamic target.

Reproducible example

library(drake)

plan <- drake_plan(
  numbers = target(
    seq_len(2), 
    format = "qs"),
  again = target(
    numbers))
make(plan)
#> ▶ target numbers
#> ▶ target again

clean(destroy = TRUE)

plan <- drake_plan(
  numbers = target(
    seq_len(2), 
    format = "qs"),
  again = target(
    numbers,
    dynamic = map(numbers)))
make(plan)
#> ▶ target numbers
#> Error: Input must be a vector, not a `drake_format_qs/drake_format` object.

clean(destroy = TRUE)

plan <- drake_plan(
  numbers = target(
    seq_len(2)),
  again = target(
    numbers,
    dynamic = map(numbers)))
make(plan)
#> ▶ target numbers
#> ▶ dynamic again
#> > subtarget again_0b3474bd
#> > subtarget again_b2a5c9b8
#> ■ finalize again

clean(destroy = TRUE)

plan <- drake_plan(
  initial = target(
    seq_len(2)),
  numbers = target(
    initial,
    dynamic = map(initial),
    format = "qs"),
  again = target(
    numbers,
    dynamic = map(numbers)))
make(plan)
#> ▶ target initial
#> ▶ dynamic numbers
#> > subtarget numbers_0b3474bd
#> > subtarget numbers_b2a5c9b8
#> ■ finalize numbers
#> ▶ dynamic again
#> > subtarget again_44fc887c
#> > subtarget again_ae868dc2
#> ■ finalize again

^{Created on 2020-03-10 by the reprex package (v0.3.0)}

Desired result

I expected all three plans to finish, with again being the same in each.

Session Info

Session info

devtools::session_info()
#> ─ Session info ───────────────────────────────────────────────────────────────
#>  setting  value                       
#>  version  R version 3.6.1 (2019-07-05)
#>  os       Ubuntu 18.04.4 LTS          
#>  system   x86_64, linux-gnu           
#>  ui       X11                         
#>  language (EN)                        
#>  collate  en_US.UTF-8                 
#>  ctype    en_US.UTF-8                 
#>  tz       America/New_York            
#>  date     2020-03-10                  
#> 
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#> 
#> [1] /home/psadil/R/x86_64-pc-linux-gnu-library/3.6
#> [2] /usr/local/lib/R/site-library
#> [3] /usr/lib/R/site-library
#> [4] /usr/lib/R/library

[wlandau]

That's certainly not supposed to happen. Should be fixed now.