Allow WAL to have invalid row

[nakabonne]

Ref #37

[codecov-commenter]

Codecov Report

Merging #39 (42f896a) into main (cf153b5) will decrease coverage by 0.08%.
The diff coverage is 25.00%.

@@            Coverage Diff             @@
##             main      #39      +/-   ##
==========================================
- Coverage   62.34%   62.26%   -0.07%     
==========================================
  Files          19       19              
  Lines        1123     1126       +3     
==========================================
+ Hits          700      701       +1     
- Misses        292      293       +1     
- Partials      131      132       +1     

Impacted Files	Coverage Δ
disk_wal.go	49.34% <25.00%> (-0.32%)	⬇️

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