mathlib

2f1b3131 - chore(data/zmod): make `zmod.int_cast_zmod_cast` `@[norm_cast]` (#15753)

chore(data/zmod): make `zmod.int_cast_zmod_cast` `@[norm_cast]` (#15753) I was suprised that `norm_cast` couldn't do anything with an expression including `(((r : zmod 4) : ℤ) : zmod 4)`, turns out this lemma was missing a `norm_cast` attribute.