More tests

[gdalle]

Compat

• Bump version to 0.3.1

Source

• Replace @views with view and split lines for easier debugging
• Add nnz equality check between A and S (proxy for whole sparsity structure)

Tests

• Add small controlled tests

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 99.06%. Comparing base (ac70240) to head (65012a4).

Files	Patch %	Lines
src/decompression.jl	91.66%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              main       #8      +/-   ##
===========================================
- Coverage   100.00%   99.06%   -0.94%     
===========================================
  Files            7        7              
  Lines          204      215      +11     
===========================================
+ Hits           204      213       +9     
- Misses           0        2       +2     

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