Highlights :tada:

• Significantly optimize transfers from Scala to Python, which are now up to 5x faster on the JVM and 4x faster on Scala Native (PR #179)
• Optimize transfers from Python to Scala, which are now up to 4x faster on the JVM and 3x faster on Scala Native (PR #183)
• Introduce a pre-alpha type facade generator that generates Scala types through mypy (PR #110)
  • This is pre-alpha in the sense that types generated for any module, including Python builtins, are likely to require manual patching to compile
  • However, with a bit of patching, the types for many libraries are good enough to use directly without having to fall back to dynamic interfaces
  • The current type generator has been merged as a very experimental feature just so that others in the community can try it out. It will be rewritten in the near future with a cleaner architecture that will enable generation of more complex types correctly.
• Python values can now be loaded into any immutable Scala collection type as a copy, not just Seq (PR #179)
• Allow converting nested sequences to Python using a single call to toPythonCopy or toPythonProxy (PR #178)
• Add API equivalents for the Python del keyword (del foo.bar, del foo["key"], and del foo) (PR #175, PR #177)
• Support referential equality of Python values with a corresponding hash-code implementation (PR #110)

Breaking Changes :warning:

• Reading a Python collection as an immutable sequence will now load a copy. To load a proxy that can observe changes, load sequences with .as[mutable.Seq[...]] (PR #179)
• Calling the apply method on a py.Dynamic value will now directly call the original value as-is instead of the apply method of the value in Python (PR #177)
  • To call the original value with keyword arguments, you can use the new applyNamed API, passing in tuples of keyword arguments and values
  • To call the original apply method in Python, use applyDynamic explicitly (myValue.applyDynamic("apply")(arg1, arg2, ...))

v0.4.2

Highlights :tada:

• Upgrade Scala Native to 0.4.0, which brings support for Scala 2.12 and 2.13 (PR #147)
• Add support for Python 3.8 and 3.9 (PR #139)

Breaking Changes :warning:

• Support for Scala 2.11 has been dropped in order to focus efforts on 2.12/2.13 (PR #147)