List as is

[AlexAxthelm]

This PR adds functions to modify lists, given a path in the list. That is, given a list (preferably, but not necessarily named) and a position, you can apply a function to a given element. So with position = c("a", "b", "c"), the function would apply whatever function is provided to x$a$b$c and no other elements (thematically related to, but very different from purrr::map_depth).

Motivation: While working on a feature to handle multiple files in workflow.pacta, the param parsing function was throwing errors when checking that the params still validate against the schema after inheriting defaults.

The issue was that files was being specified as an array, but with the new schema, jsonlite::toJSON(..., auto_unbox = TRUE) was casting length-1 vectors as scalars (the behavior we want for almost everything else). To correct that issue, we need to mark the files entity as As-Is, using the I() function. The new functions in this PR allow that to happen.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.07%. Comparing base (838ea80) to head (f8d3978).
Report is 20 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #33      +/-   ##
==========================================
+ Coverage   97.96%   98.07%   +0.10%     
==========================================
  Files           9       10       +1     
  Lines         591      622      +31     
==========================================
+ Hits          579      610      +31     
  Misses         12       12              

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[jdhoffa]

lgtm!

And thank you for the in-depth description of the PR, will be very helpful in case we ever need to look at this in the future :-)