Valentin Shergin 7048c9134a Fabric: Support for optionals in convertRawProp and debugStringConvertibleItem templates
Summary:
We have to have automatic treatment for `optional` types. So, if we can process type `T` we can also automatically process `optional<T>.`
Support for optional allows us to not introduce new types (with embedded special "undefined" value) or pollute existing pure types (with special "undefined" value). (A lot of examples of those types can be found in AttributedString module.)

Reviewed By: fkgozali

Differential Revision: D7958249

fbshipit-source-id: 21af526a17dd0329e1262020cab8ecb902316654
2018-05-14 16:03:49 -07:00
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