Minor speed improvements

[lorenzwalthert]

Probably wrong benchmarks, local tests showed ~ -5%.
d82c7e0

• cache_appyling: 0.048 -> 0.039 (-18%)
• cache_recording: 1.483 -> 1.055 (-29%)
• without_cache: 4.384 -> 3.136 (-28%)

3380aa7

• cache_appyling: 0.048 -> 0.034 (-28%)
• cache_recording: 1.483 -> 0.918 (-38%)
• without_cache: 4.384 -> 2.773 (-37%)

new benchmarks show around 3% improvement.

[codecov-io]

Codecov Report

Merging #691 (3380aa7) into master (a2a2e2e) will decrease coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #691      +/-   ##
==========================================
- Coverage   90.42%   90.34%   -0.09%     
==========================================
  Files          47       47              
  Lines        2225     2226       +1     
==========================================
- Hits         2012     2011       -1     
- Misses        213      215       +2     

Impacted Files	Coverage Δ
R/compat-dplyr.R	85.71% <100.00%> (-4.53%)	⬇️
R/compat-tidyr.R	100.00% <100.00%> (ø)
R/indent.R	100.00% <100.00%> (ø)
R/initialize.R	96.96% <100.00%> (-0.09%)	⬇️
R/nest.R	100.00% <100.00%> (ø)
R/transform-files.R	100.00% <100.00%> (ø)

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