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[elixir] Typespec - allow null on optional struct-attributes

Merged Administrator requested to merge github/fork/cyon/elixir/nullable-optionals into master

Created by: mrmstn

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  • Read the contribution guidelines.
  • Ran the shell script under ./bin/ to update Petstore sample so that CIs can verify the change. (For instance, only need to run ./bin/{LANG}-petstore.sh and ./bin/security/{LANG}-petstore.sh if updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates). Windows batch files can be found in .\bin\windows\.
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Description of the PR

This PR allows null-values for struct-attributes which are not marked as required. This is very important since the compiler would mark this as a error since a null value in a struct would break the typespec contract.

With this small typespec fix, non-required and nullable attributes will be markes as possible nil values for the given model

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