nafill character, logical, etc.

[jangorecki]

closes #3992

[codecov]

Codecov Report

Merging #4980 (9bc88aa) into master (5f86efd) will decrease coverage by 0.18%.
The diff coverage is 38.63%.

❗ Current head 9bc88aa differs from pull request most recent head 014c32b. Consider uploading reports for the commit 014c32b to get more accurate results

@@            Coverage Diff             @@
##           master    #4980      +/-   ##
==========================================
- Coverage   99.47%   99.29%   -0.19%     
==========================================
  Files          75       75              
  Lines       14807    14817      +10     
==========================================
- Hits        14729    14712      -17     
- Misses         78      105      +27     

Impacted Files	Coverage Δ
src/nafill.c	86.36% <38.63%> (-13.64%)	⬇️
R/data.table.R	99.94% <0.00%> (-0.01%)	⬇️
R/fmelt.R	100.00% <0.00%> (ø)
R/fread.R	100.00% <0.00%> (ø)

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