SNIP-12 u256 hash mismatch

[JoE11-y]

Describe the bug
Currently the struct hash of typed data containing u256 doesn't match the hash struct of u256 calculated with in cairo, causing a mismatch of message signature

To Reproduce
link to gist - https://gist.github.com/JoE11-y/19b8a02c29e2f6e029f3d3fb5945add3

Expected behavior
Should match

Screenshots

Desktop (please complete the following information):

• Browser & version [e.g. chrome, safari, webworker]
• Node version [e.g. 16.0.1]: 22
• Starknet.js version: 7.6.4
• Scarb version: 2.11.4
• Network [devnet, testnet]: devnet

Additional context
Add any other context about the problem here.

[JoE11-y]

There’s also a hash mismatch when working with nested structs and the Cairo hash plugin implementation.

But got it to match by using manual hashing of each struct item "check manual hashing impl"

https://gist.github.com/JoE11-y/19b8a02c29e2f6e029f3d3fb5945add3#file-znested-structs-cairo