[Repo Assist] Fix JsonProvider pluralizer incorrectly singularizing '-ases' words (e.g. 'purchases' → 'purchasis')

[github-actions]

🤖 Repo Assist here — I'm an automated AI assistant for this repository.

Closes #1508

Root Cause

The Pluralizer.toSingular function applies suffix rules in order and stops at the first match. The rule for Latin-origin -sis/-ses pairs (e.g. analysis→analyses) matched any word ending in ses — including plain English words like purchases, cases, phases, phrases.

For example:

• "purchases" ends with "ses" → rule strips "ses", adds "sis" → "purchasis" ❌

Fix

Add a more specific "ase" / "ases" suffix rule before the "sis" / "ses" rule in the ordered list. This means words like purchases are correctly handled first:

• "purchases" → ends with "ases" → strips "ases", adds "ase" → "purchase" ✅
• "cases" → "case" ✅
• "phases" → "phase" ✅
• "phrases" → "phrase" ✅

To prevent regression for the genuine Greek/Latin word oasis/oases (which would otherwise be caught by the new "ases" rule), "oasis" is added to the special-words list so it is resolved before any suffix rule is tried.

Test Status

• Build passes (dotnet build FSharp.Data.sln -c Release)
• Tests pass (dotnet test tests/FSharp.Data.Core.Tests/FSharp.Data.Core.Tests.fsproj -c Release) — 2838 passed, 1 failed (pre-existing network connectivity failure unrelated to this change)
• New regression test added: Purchases singularizes correctly - regression test for issue 1508

Generated by Repo Assist

Warning

⚠️ Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

• www.google.com

[github-actions]

🤖 Note from Repo Assist

After creating this PR I discovered that PR #1524 by @bisen2 already addresses the same issue with an identical fix ("ase", "ases" rule before "sis", "ses"), and was already approved by @dsyme in March 2025 pending a version bump.

I've nudged @bisen2 on PR #1524. If they add the version bump, maintainers should prefer merging #1524 over this PR. This PR can be closed if #1524 is updated and merged.

Apologies for the duplication — I should have checked for existing PRs more thoroughly before creating this one.

Generated by Repo Assist

To install this workflow, run gh aw add githubnext/agentics/workflows/repo-assist.md@6c79ed2cf36b9cfa0f5b499d00a0afc4a5d8f0c0. View source at https://github.com/githubnext/agentics/tree/6c79ed2cf36b9cfa0f5b499d00a0afc4a5d8f0c0/workflows/repo-assist.md.