[laborg]

Fixes #115

With this PR the src is iterated instead of the probably longer destination.

Performance is better on this PR:

a,b=ChainedVector([rand(Int,5) for _ in 1:20000]),[1:100000...] # many chunks
@btime map!(i->-i,a,b)
# main: 188us
# pr: 153us

a,b=ChainedVector([[1:100000...]]),[1:100000...] # one chunk
@btime map!(i->-i,a,b)
# main: 171us
# pr: 73.8us

[quinnj]

[Reviewed by AI] Reviewed d179757d1480b996c56019e435be736058d0f5ed. No actionable findings in the changed overloads. The full suite passed locally on Julia 1.13/macOS arm64. Focused Base-vector checks cover empty and shorter sources, unchanged destination tails, chunk boundaries, and overlapping views. The short-source example fails on the base and passes here.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.60%. Comparing base (fa840f9) to head (8ec399d).
⚠️ Report is 19 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #116      +/-   ##
==========================================
+ Coverage   94.82%   95.60%   +0.77%     
==========================================
  Files           5        5              
  Lines        1043     1046       +3     
==========================================
+ Hits          989     1000      +11     
+ Misses         54       46       -8     

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[quinnj]

Thanks @laborg, and sorry this sat so long. Verified: iterating zip of both index sets stops at the shorter source, which matches Base's map! contract and fixes #115. Full suite passes with this merged on top of current main.