Cache leakage proof, link 2 restored, and the cache tests - #25

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache@v4, actions/checkout@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Pattern matching on GADTs without MonoLocalBinds is fragile.

• Defaulting the type variable ‘a0’ to type ‘Integer’ in the following constraints

The qualified import of ‘Prelude’ is redundant

• The constraint ‘MonadMemory m’ matches

• Defaulting the type variable ‘a0’ to type ‘Integer’ in the following constraints

• Defaulting the type variable ‘a0’ to type ‘Integer’ in the following constraints

• Defaulting the type variable ‘a0’ to type ‘Integer’ in the following constraints

• Defaulting the type variable ‘a0’ to type ‘Integer’ in the following constraints

• Defaulting the type variable ‘a0’ to type ‘Integer’ in the following constraints

• Both DeriveAnyClass and GeneralizedNewtypeDeriving are enabled