Address αs interpolation when defined in .dat

[Radonirinaunimi]

• Add more tests

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.37%. Comparing base (cfeb446) to head (da873c3).
⚠️ Report is 12 commits behind head on master.

Files with missing lines	Patch %	Lines
neopdf/src/parser.rs	88.88%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #77      +/-   ##
==========================================
- Coverage   79.87%   78.37%   -1.51%     
==========================================
  Files          27       27              
  Lines        5034     5058      +24     
==========================================
- Hits         4021     3964      -57     
- Misses       1013     1094      +81     

Flag	Coverage Δ
capi	42.59% <62.96%> (+0.10%)	⬆️
python	44.16% <88.88%> (-0.67%)	⬇️
rust	81.07% <88.00%> (-2.04%)	⬇️

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