fix(java,dotnet): emit default implementations for optional properties #906
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For optional properties on interfaces, emit default implementations when possible (for .NET, this requires `netcoreapp3.0` or later) so that adding a new optional property on an interface does not break existing core that implements the interface. In it's current form, the getters always return `null`, while the setters throw an exception (this may change in the future). Fixes #543
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rix0rrr
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For optional properties on interfaces, emit default implementations (for .NET,
this required upgrading the target to
netcoreapp3.0) so that adding a newoptional property on an interface does not break existing code that implements
the interface.
In it's current form, the getters always return
null, while the setters throw anexception unless overridden.
Fixes #543
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