# Migration from 1.1.41 to 1.2.0 Version 1.2.0 adds the canonical ECAD toolkit API. Existing Altium exports are retained under `altium-toolkit/extensions`. Starting with 1.4.17, native implementations and assets are maintained: reviewed bug fixes and performance improvements may change their source and corrected behavior. Historical export signatures and public asset entrypoints and targets remain checked. The immutable 1.1.41 source tree and manifest remain provenance evidence, not a claim of current byte equality. The release gate retains every historical implementation path and compares every packed source file against a snapshot of the tested checkout, including new helpers and workers. Public contract and synthetic regression tests validate maintained behavior. See [testing](testing.md) for the complete release checks. The paged appendix maps every frozen export, static member, prototype member, public asset, and the native implementation tree: - [Legacy mapping 001](migration/legacy-001.md) (300 rows) - [Legacy mapping 002](migration/legacy-002.md) (300 rows) - [Legacy mapping 003](migration/legacy-003.md) (300 rows) - [Legacy mapping 004](migration/legacy-004.md) (300 rows) - [Legacy mapping 005](migration/legacy-005.md) (102 rows)