Align with the new HDF5 policy for missing values, datatypes.

[LTLA]

No description provided.

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (45dbccc) 95.71% compared to head (3bcb8aa) 96.01%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #13      +/-   ##
==========================================
+ Coverage   95.71%   96.01%   +0.30%     
==========================================
  Files          19       19              
  Lines        1447     1481      +34     
  Branches       25       23       -2     
==========================================
+ Hits         1385     1422      +37     
+ Misses         37       36       -1     
+ Partials       25       23       -2     

Files	Coverage Δ
tests/src/external.cpp	100.00% <100.00%> (ø)
tests/src/integer.cpp	100.00% <100.00%> (ø)
tests/src/list.cpp	100.00% <100.00%> (ø)
tests/src/misc.cpp	100.00% <ø> (ø)
tests/src/number.cpp	100.00% <100.00%> (ø)
include/uzuki2/parse_hdf5.hpp	94.76% <93.84%> (+1.60%)	⬆️

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