Properly handle i64::MIN when converting to Duration

[hollmmax]

fixes #632

[codecov]

Codecov Report

Merging #633 (7503651) into master (1f465b9) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #633      +/-   ##
==========================================
- Coverage   64.47%   64.44%   -0.04%     
==========================================
  Files          36       36              
  Lines        2159     2157       -2     
==========================================
- Hits         1392     1390       -2     
  Misses        767      767              

Files Changed	Coverage Δ
serde_with/src/utils/duration.rs	87.34% <100.00%> (-0.16%)	⬇️

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[jonasbb]

Thank you for resolving the issue. Indeed, the code in this crate shouldn't panic, but for most cases return a serialization error if something happens. The solution with abs_diff is nice.

I can release the fix tomorrow.

bors r+

[bors]

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