Commits on Mar 26, 2024

1. Swift Option<String> and Option<&str> …

   This commit adds support for passing `Option<String>` to and from
   `extern "Swift"` functions, as well as for passing `Option<&str>` to
   extern "Swift" functions.
   
   For example, the following is now possible:
   
   ```rust
   #[swift_bridge::bridge]
   mod ffi {
       extern "Swift" {
           fn opt_string_function(arg: Option<String>) -> Option<String>;
   
           fn opt_str_function(arg: Option<&str>);
       }
   }
   ```
   
   Note that you can not yet return `-> Option<&str>` from Swift.
   
   This is an uncommon use case, so we're waiting until someone actually
   needs it.

   

   chinedufn committed Mar 26, 2024
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