fix(openapi): omit null and undefined members in delimited-object query styles

[dinwwwh]

With the `comma-delimited-object`, `space-delimited-object`, or `pipe-delimited-object` query styles, `OpenAPILink` was sending null and undefined object members as the literal strings `"null"` and `"undefined"`. So `{ filters: { a: undefined, b: '1', c: null } }` reached the procedure as `{ a: 'undefined', b: '1', c: 'null' }` instead of `{ b: '1' }`. These members are now omitted, as the delimited-array styles and path params already did.

Fixes

• Null and undefined members are left out of delimited-object query values
• An object whose members are all null or undefined leaves the query parameter out entirely

Testing

• New test covers null and undefined members across all six delimited query styles (array and object for each delimiter). It fails before the fix with `a,undefined,b,1,c,null`
• All `@orpc/openapi` tests pass

[pullfrog]

✅ No new issues found.

Reviewed changes

The one-line fix corrects a destructuring typo in encodeDelimitedObject that let null/undefined object members reach the query string as the literal strings "null"/"undefined" for the comma-/space-/pipe-delimited-object styles.

• encodeDelimitedObject filter fixed — packages/openapi/src/adapters/standard/openapi-link-codec.ts:511 now destructures the value (([, v])) instead of the key (([v])), matching the already-correct encodeDelimitedArray at :500.
• New test across all six delimited styles — packages/openapi/src/adapters/standard/openapi-link-codec.test.ts:429 covers array and object variants for each delimiter, plus an all-null/undefined object asserting the parameter is omitted entirely.

I ran the test file on head (51 passed) and also reverted the fix locally to confirm the new test genuinely fails without it — it does, with expected 'a,undefined,b,1,c,null' to be 'b,1'. No other instances of the buggy filter(([v]) => pattern exist in the repo.

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commit: 573fced

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[codspeed]

Merging this PR will degrade performance by 12.65%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

❌ 1 regressed benchmark
✅ 29 untouched benchmarks

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
❌	octet stream	640.3 µs	733.1 µs	-12.65%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing dinwwwh:claude/openapi-link-codec-filter-fix-1de188 (573fced) with main (a16c885)}