What's Changed
* make all getters for Rust objects read only by adriangb in https://github.com/pydantic/pydantic-core/pull/429
* Fix typehint for discriminator; add test by dmontagu in https://github.com/pydantic/pydantic-core/pull/441
* Update repr of SchemaValidator by dmontagu in https://github.com/pydantic/pydantic-core/pull/442
* Convert tuples from *args into lists in schemas by adriangb in https://github.com/pydantic/pydantic-core/pull/431
* Support dict keys, values and items on PyPy by adriangb in https://github.com/pydantic/pydantic-core/pull/448
* Uprev version to 0.12.1 by adriangb in https://github.com/pydantic/pydantic-core/pull/449
**Full Changelog**: https://github.com/pydantic/pydantic-core/compare/v0.12.0...v0.12.1