Commits on Aug 23, 2022

1. typeexpr: Optional object attributes with defaults …

   This commit extends the type expression package to add two new features:
   
   - In constraint mode, the `optional(...)` modifier can be used on object
     attributes to allow them to be omitted from input values to a type
     conversion process. Any such missing attributes will be replaced with
     a `null` value of the appropriate type upon conversion.
   - In the new defaults mode, the `optional(...)` modifier takes a second
     argument, which accepts a default value of an appropriate type. These
     defaults are returned alongside the type constraint, and may be
     applied prior to type conversion through the new `Defaults.Apply()`
     method.
   
   This change is upstreamed from Terraform, where optional object
   attributes have been available for some time. The defaults functionality
   is new and due to be released with Terraform 1.3.

   

   alisdair committed Aug 23, 2022
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