Support swapped offset-encoded 4+4-bit integers

[eschnett]

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Project coverage is 9.41%. Comparing base (1f4fa2c) to head (5419649).

Files with missing lines	Patch %	Lines
src/IndexSpaces.jl	0.00%	11 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff            @@
##            main      #7      +/-   ##
========================================
- Coverage   9.45%   9.41%   -0.05%     
========================================
  Files          1       1              
  Lines       1713    1721       +8     
========================================
  Hits         162     162              
- Misses      1551    1559       +8     

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