v1.2.3

• @class/@shape can now inherit from aliased types.
• Made doc tables behave more like shapes.
  As a result also improved doc table tuple support. Main outstanding differences:
  • Doc tables cannot inherit from shapes.
  • Doc tables cannot be callable types.
• Added support for doc strings trailing @alias definitions, displayed in IDE mouse-over popup.
• Added support for multiple @alias appearing in the same doc comment i.e. blank lines are no longer required between @alias.
• Improved indexing performance.
• Improved inference performance (IDE responsiveness), particularly in the presense of deeply nested scopes.
• Improved illegal inheritance inspection.
• Improved handling of table fields whose index type is unable to be inferred during indexing.
• Corrected/refined os.date() stdlib definition.
• Worked around JBR/Kotlin initializer deadlock..
• Fixed generic inference when param is returned in multiple results.
• Fixed incorrect "Illegal override" of fun with multiple results.
• Fixed @vararg not accepting complex types (fun etc.)
• Fixed occasional incorrect "Generic parameters cannot be shadowed".
• Fixed variance detection of fields being assigned to a generic shape where the index of the source field is covariant of the
  index of the target field, and the target field's type contains a generic parameter.
• Fixed auto-completion of aliases and unions.
• Fixed incorrect type-checking of arguments passed to fun (without a parameter list).
• Fixed inference of closures containing nested closures (containing return statements).
• Fixed lexing of aliases with constrained generics.