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Use 128 bits for TypeId hash Preliminary/Draft impl of https://github.com/rust-lang/compiler-team/issues/608 Prior art (probably incomplete list) - https://github.com/rust-lang/rust/pull/75923 - https://github.com/rust-lang/rust/pull/95845
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.