If I have the following golang code
```
package sdk
type Person struct { }
func (p *Person) GetName() (string, error) {
return "", errors.New("...")
}
```
When I package it as xcframwork, its header file will probably look like
this
```
*@interface* SdkPerson : NSObject <goSeqRefInterface> {}
// .......
- (NSString* *_Nonnull*)getName:(NSError* *_Nullable** *_Nullable*)error;
@end
```
Then when I call this method in swift I will have to write
```
*var* error: NSError? = *nil*
*let name = person.getName(&error)*
*if let error = error {*
* throw error*
*}*
```
But if we can modify the return value of string to Nullable
`- (NSString* *_Nullable*)getName:(NSError* *_Nullable** *_Nullable*)error;`
Then it will be much easier to write swift code
```
let name = try person.getName()
```
We will write three less lines of code
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