• Fixed the equality bug in PersistentMap — Added proper node promotion during mutable operations to ensure a consistent internal tree structure #217
• Fixed the bug in PersistentMap equals implementation — Ensured proper node promotion during mutable key removal even when nodes share the same owner #218
• Fixed the ghost element issue in PersistentHashSet — Corrected condition check order to ensure proper recursive element promotion after collision removal #219
• Updated Kotlin to version 2.1.20 and core dependencies #213
• Enabled '-Xjvm-default=disable' explicitly to prevent API dump changes #210