Coord arith: allow subtracting negative offsets

[LebedevRI]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 97.29730% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 96.95%. Comparing base (53db38e) to head (fd725b6).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/std/coord_arith/tests.rs	96.96%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
src/std/coord_arith/mod.rs	100.00% <100.00%> (ø)
src/std/coord_arith/tests.rs	99.55% <96.96%> (-0.45%)	⬇️

@@            Coverage Diff             @@
##           master      #73      +/-   ##
==========================================
- Coverage   96.95%   96.95%   -0.01%     
==========================================
  Files         101      101              
  Lines       16070    16092      +22     
  Branches    16070    16092      +22     
==========================================
+ Hits        15581    15602      +21     
- Misses        229      230       +1     
  Partials      260      260              

Components	Coverage Δ
source code	90.24% <100.00%> (ø)
tests	98.22% <96.96%> (-0.01%)	⬇️

Flag	Coverage Δ
LLVM=16	96.95% <97.29%> (-0.01%)	⬇️
LLVM=19	96.95% <97.29%> (-0.01%)	⬇️
endianness=little	96.95% <97.29%> (-0.01%)	⬇️
host=aarch64	96.95% <97.29%> (-0.01%)	⬇️
host=x86_64	96.95% <97.29%> (-0.01%)	⬇️
linux	96.95% <97.29%> (-0.01%)	⬇️
macos	96.95% <97.29%> (-0.01%)	⬇️
profile=dev	96.95% <97.29%> (-0.01%)	⬇️
profile=release	96.95% <97.29%> (-0.01%)	⬇️
rust=aarch64-pc-windows-msvc	96.95% <97.29%> (-0.01%)	⬇️
rust=aarch64-unknown-linux-gnu	96.95% <97.29%> (-0.01%)	⬇️
rust=nightly	96.83% <97.29%> (-0.01%)	⬇️
rust=stable	96.95% <97.29%> (-0.01%)	⬇️
rust=x86_64-pc-windows-msvc	96.95% <97.29%> (-0.01%)	⬇️
rust=x86_64-unknown-linux-gnu	96.95% <97.29%> (-0.01%)	⬇️
target=aarch64	96.95% <97.29%> (-0.01%)	⬇️
target=x86_64	96.95% <97.29%> (-0.01%)	⬇️

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