More rigorous support for missing values via placeholders.

[LTLA]

No description provided.

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (eb74a97) 93.45% compared to head (4a2087b) 93.59%.

❗ Current head 4a2087b differs from pull request most recent head 157b1ab. Consider uploading reports for the commit 157b1ab to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #6      +/-   ##
==========================================
+ Coverage   93.45%   93.59%   +0.13%     
==========================================
  Files          19       19              
  Lines        1483     1592     +109     
  Branches       25       26       +1     
==========================================
+ Hits         1386     1490     +104     
- Misses         72       76       +4     
- Partials       25       26       +1     

Files	Coverage Δ
include/uzuki2/parse_json.hpp	87.17% <100.00%> (ø)
tests/src/boolean.cpp	100.00% <100.00%> (ø)
tests/src/factor.cpp	100.00% <100.00%> (ø)
tests/src/integer.cpp	100.00% <100.00%> (ø)
tests/src/number.cpp	100.00% <100.00%> (ø)
include/uzuki2/parse_hdf5.hpp	92.01% <88.67%> (-0.64%)	⬇️

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