Integer literals now produce `Ty::UnboundInt` instead of a hardcoded
`i32`. This flexible type promotes to/from any concrete integer, so
literals resolve naturally in context (e.g. `n < 2` when `n: u8`
works without an explicit cast).
`common(UnboundInt, T)` returns `T` when `T` is a concrete integer,
so binary ops adopt the concrete operand's type. Includes 8 new tests
covering literal coercion, fibonacci-style patterns, and negative cases
(literals still don't coerce to float types).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Jooris Hadeler
bb5e9e42d9