handle invalid mappings

[sokra]

ignore invalid mappings when reading a source map

avoid generating invalid mappings when source maps contains mapping for the final position

[codecov]

Codecov Report

Merging #127 (dfff046) into main (d103b21) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #127      +/-   ##
==========================================
+ Coverage   92.50%   92.52%   +0.02%     
==========================================
  Files          21       21              
  Lines        1561     1579      +18     
  Branches      451      461      +10     
==========================================
+ Hits         1444     1461      +17     
- Misses        108      109       +1     
  Partials        9        9              

Flag	Coverage Δ
integration	92.52% <100.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
lib/ConcatSource.js	92.57% <ø> (-0.09%)	⬇️
lib/PrefixSource.js	82.00% <100.00%> (+0.36%)	⬆️
lib/helpers/readMappings.js	98.11% <100.00%> (+2.19%)	⬆️
lib/helpers/streamChunksOfSourceMap.js	96.85% <100.00%> (-1.07%)	⬇️

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