[KristofferC]

Replace the removed private _counttuple helper with fieldcount.

Add iterator trait regression tests for zip_longest.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.41%. Comparing base (7ac0198) to head (8ca671a).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #151      +/-   ##
==========================================
+ Coverage   91.25%   92.41%   +1.15%     
==========================================
  Files           1        1              
  Lines         389      369      -20     
==========================================
- Hits          355      341      -14     
+ Misses         34       28       -6     

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[KristofferC]

cc @nsajko (would be good with a new release with this fix)

[KristofferC]

(I can't merge)

didn't look close enough

[IanButterworth]

Claude:

IterTools has failed PkgEval on Julia nightly (1.15-DEV) since July 2026, because it uses the removed internal Base.Iterators._counttuple. This PR fixes it. The current CI failure comes from the applied review suggestion: @test IteratorEltype(typeof(it))) == Base.HasEltype() has an extra ). With that removed, could this be merged and released?

Written with Claude Code (Opus 5.5).