CRAN test fixes for rvar on R 4.4

[mjskay]

Summary

This is a handful of minor fixes for rvar on R 4.4, and closes #304. All of these fixes address slight changes in the handling of dimnames or function arguments in R 4.4 and have no meaningful impact on functionality.

Copyright and Licensing

By submitting this pull request, the copyright holder is agreeing to
license the submitted work under the following licenses:

• Code: BSD 3-clause (https://opensource.org/licenses/BSD-3-Clause)
• Documentation: CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

[codecov-commenter]

Codecov Report

Merging #305 (2c101ff) into master (6add3e6) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 2c101ff differs from pull request most recent head b8f7da1. Consider uploading reports for the commit b8f7da1 to get more accurate results

@@           Coverage Diff           @@
##           master     #305   +/-   ##
=======================================
  Coverage   95.60%   95.60%           
=======================================
  Files          47       47           
  Lines        3682     3683    +1     
=======================================
+ Hits         3520     3521    +1     
  Misses        162      162           

Files	Coverage Δ
R/rvar-bind.R	98.73% <100.00%> (ø)
R/rvar-math.R	100.00% <100.00%> (ø)
R/rvar-slice.R	100.00% <100.00%> (ø)

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[github-actions]

This is how benchmark results would change (along with a 95% confidence interval in relative change) if 2c101ff is merged into master:

•   :ballot_box_with_check:as_draws_array: 138ms -> 138ms [-0.74%, +0.22%]
•   :ballot_box_with_check:as_draws_df: 48ms -> 48.5ms [-0.08%, +1.95%]
•   :ballot_box_with_check:as_draws_list: 253ms -> 252ms [-0.98%, +0.45%]
•   :ballot_box_with_check:as_draws_matrix: 43.2ms -> 42.6ms [-2.67%, +0.02%]
•   :ballot_box_with_check:as_draws_rvars: 230ms -> 230ms [-1.14%, +1.49%]
•   :ballot_box_with_check:summarise_draws_100_variables: 955ms -> 955ms [-0.39%, +0.38%]
•   :ballot_box_with_check:summarise_draws_10_variables: 106ms -> 106ms [-1.4%, +1.02%]
  Further explanation regarding interpretation and methodology can be found in the documentation.

[paul-buerkner]

Thank you so much for you fixing these issues so quickly!

[mjskay]

no problem!