fix: widen fetchAccountNonce key param to number | bigint

[sherifahmed990]

The nonce key is a uint192, which a JS number cannot represent beyond 2^53-1 (e.g. keccak-derived parallel-lane keys). The implementation already coerces via BigInt(key); this aligns the declared type with it. number stays accepted for backward compatibility.

Summary by CodeRabbit

• New Features
  • Account nonce retrieval now supports nonce keys provided as either numbers or bigints.
  • Enables reliable use of parallel nonce channels beyond JavaScript’s safe integer range.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: a28abe7f-1109-4ce9-9121-a7f2846206f4

📥 Commits

Reviewing files that changed from the base of the PR and between e76c8e6 and cc91632.

📒 Files selected for processing (1)

• src/utils.ts

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📝 Walkthrough

Walkthrough

fetchAccountNonce now accepts nonce keys as either number or bigint, documents support for large parallel nonce channels, and continues converting the key to BigInt for the RPC call.

Changes

Nonce Key Support

Layer / File(s)	Summary
Widen fetchAccountNonce nonce key src/utils.ts	The nonce key parameter accepts number or bigint, defaults to 0, and documents bigint support for values beyond JavaScript’s safe integer range.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Poem

I’m a rabbit hopping light,
BigInt keys now fit just right.
Nonce channels stretch and grow,
RPC gets the value it should know.
Tidy types, a joyful byte!

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description explains the change, but it is missing the required Summary, Test, and Risk / Compatibility sections.	Add the three required sections and include a brief test note plus any compatibility or migration impact.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise and accurately states the main change to widen fetchAccountNonce's key type.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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