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Export fieldhash from Hash::Util #1909
Description
Summary
PerlOnJava's bundled Hash::Util omits the core fieldhash export, preventing CPAN module Hash::ExtendedKeys from loading. The same consumer also exposed two related compatibility gaps in the bundled fieldhash and tied-hash runtime paths: ordinary scalar keys were rejected by fieldhash, and false EXISTS callback results were not normalized to Perl's canonical boolean scalar.
Reproducer
use Hash::Util qw(fieldhash);
fieldhash my %fields;
$fields{plain_key} = 'value';For tied hashes, system Perl normalizes undef or 0 returned by EXISTS to a defined empty string, and truthy callback values to 1.
CPAN evidence
- Distribution:
Hash-ExtendedKeys1.01 - CPAN random tester run:
20261027-085020-3852 - Original failing test:
t/00-load.t; the import aborted before the suite proceeded - System Perl 5.42.2: complete unchanged upstream suite passes (7 files, 24 tests)
- PerlOnJava Perl 5.044001: original import failure reproduced on both JVM and interpreter backends
The failure was observed on macOS 26. PR #1910 adds regression coverage for the export, scalar-key behavior and tied-hash boolean normalization. After those fixes, t/00-load.t and t/03-coverage.t pass on PerlOnJava. The remaining t/01-idea.t and t/02-tie.t are blocked by the transitive XS dependency Combine::Keys, which fails with Undefined subroutine &Combine::Keys::ckeys.
This is distinct from #1379, which fixed Hash::Util::FieldHash's :all export tag.
Acceptance
- Export
fieldhashfromHash::Utilwith core-compatible behavior. - Preserve ordinary scalar-key operations and identity-based reference keys.
- Normalize tied-hash
EXISTSresults to1or''on both execution backends. - Keep focused project-owned coverage green on system Perl and both PerlOnJava backends.
Activity
fglock commentedon Oct 28, 2026
State: handed-off
Agent/session: Codex API session 2026-10-28 hash-util-fieldhash
Scope: #1909, restore Hash::Util fieldhash compatibility and Perl tied-hash exists booleans
Work: fix/hash-util-fieldhash-export, PR #1910, API head 8b2dd63 on master 16b5a7d
Checkpoint: 2026-10-28; draft PR updated with fieldhash and false-exists fixes
Evidence:
nice -n 19 makepassed; both new focused tests pass on system Perl and both PerlOnJava backends;make check-linkspasses; CPAN Hash-ExtendedKeys t/00-load.t and t/03-coverage.t pass after fixBlocked by: none
Next: CI/review on PR #1910; the only remaining CPAN suite failures are t/01-idea.t and t/02-tie.t at missing XS
Combine::Keys::ckeysfix: normalize tied hash exists results
fglock commentedon Oct 28, 2026
Verification follow-up for PR #1910:
8b2dd6354cb593671684372b39f764cee8c37645) on Linux and Windows.Hash::Utilfieldhash and tied-hashexistsregressions pass on system Perl and both PerlOnJava backends.Hash-ExtendedKeys1.01t/00-load.tandt/03-coverage.tpass on PerlOnJava after the fix.t/01-idea.tandt/02-tie.tstop when the transitive XS dependencyCombine::Keyscalls unavailableCombine::Keys::ckeys. System Perl passes all 7 files / 24 tests.The compatibility defects covered by this PR are fixed. Keep this issue open through review and merge; the remaining XS dependency limitation is follow-up work outside this PR.
fix: export fieldhash from Hash::Util (#1910)
fglock commentedon Oct 28, 2026
PR #1910 merged on 2026-10-28 as
ed3fb02aa684beede175ad0120398da15677692b; GitHub closed this issue through the PR closing reference. Linux and Windows CI passed on the merged PR head.The
Hash::ExtendedKeysfieldhash import and tied-hashexistscompatibility defects are fixed. Its full unchanged CPAN suite remains partially unverified on PerlOnJava becauset/01-idea.tandt/02-tie.treach the unavailable transitive XS functionCombine::Keys::ckeys;t/00-load.tandt/03-coverage.tpass. This is separate follow-up work and does not reopen the resolved issue.