Incorrect types returned from some generated read contract hooks

[iceanddust]

Check existing issues

• I checked there isn't already an issue for the bug I encountered.

Describe the bug

With the changes implemented in the Wagmi@3.3.2 update, some generated read contract hooks coming from the @wagmi/cli package started returning incorrect types.

See the minimal reproducible example:
For the ABI generated, the return type of the ilks function should be
readonly [bigint, rate: bigint, bigint, bigint, bigint]
However, that type is only returned by the specific react contract function hook (useReadMcdVatIlks), if I use the more general read contract hook (useReadMcdVat), passing the same function name and argument, the return type is
bigint | readonly [bigint, rate: bigint, bigint, bigint, bigint]

Link to Minimal Reproducible Example

https://stackblitz.com/edit/new-wagmi-t3ymsfba?file=src%2FApp.tsx

Steps To Reproduce

In case you want to regenerate the ABI and hooks:

• Replace the etherscan API key in the wagmi.config.ts file
• Run pnpm wagmi generate

Then,

• Check the App.tsx file and look at the return type of the data prop of both hooks. They should be the same, but they're not

What Wagmi package(s) are you using?

wagmi

Wagmi Package(s) Version(s)

3.5.0

Viem Version

2.46.3

TypeScript Version

5.9.3

Anything else?

No response

[theamodhshetty]

Opened a fix in #5020.

I was able to reproduce the widening when two view functions share the same argument shape, and the patch narrows createUseReadContract around the selected functionName again. I also added a type regression for that case.