v1.20.3

1. Enhancements

Elixir

• [Kernel.ParallelCompiler] Batch type checker cache operations to improve compilation times

2. Bug fixes

Elixir

• [Kernel] Improve type precision of the ++/2 operator
• [Kernel] Improve type precision of the send/2 return type
• [Kernel] Improve type refinement for and/2 and or/2
• [Kernel] Fix type checking of Map.put/3 on empty map types
• [Kernel] Fix type checking of tuple insertion on equivalent tuple types
• [Kernel] Fix type checking of tuple insertion on gradual types with empty static parts
• [Kernel] Fix variable refinements leaking from invalid receive/after timeout expressions
• [Kernel] Fix rendering inferred types containing unions of static and dynamic functions
• [Kernel] Ensure typing errors in :maps.values/1 reference the correct function
• [Kernel] Mark %_{} patterns as precise so subsequent redundant struct clauses are detected
• [elixirc] Fix parsing of the --profile time option

IEx

• [IEx.Helpers] Fix break!/1 with unknown expressions