rewrite file handle, adjust file.seek()

[Flipez]

This closes #35

Signed-off-by: Flipez [email protected]

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[codecov-commenter]

Codecov Report

Merging #36 (d9a4ea0) into master (189458c) will decrease coverage by 0.08%.
The diff coverage is 50.57%.

@@            Coverage Diff             @@
##           master      #36      +/-   ##
==========================================
- Coverage   73.65%   73.57%   -0.09%     
==========================================
  Files          26       26              
  Lines        2137     2187      +50     
==========================================
+ Hits         1574     1609      +35     
- Misses        497      513      +16     
+ Partials       66       65       -1     

Impacted Files	Coverage Δ
object/file.go	50.00% <39.43%> (+2.74%)	⬆️
object/error.go	100.00% <100.00%> (ø)
stdlib/open.go	100.00% <100.00%> (+9.52%)	⬆️

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