99designs / gqlgen / 14430430189

Pull #3660

github

Omittable supports IsZero method for omitzero

API may behave differently when JSON is undefined versus when it is null.

- undefined
  - no effect
  - json: `{}`

```go
input := UserUpdateInput{
		Name:         graphql.Omittable[string]{},
}
```

- null
  - removes name
  - json: `{"name":null}`

```go
input := UserUpdateInput{
		Name:         graphql.OmittableOf[string](null),
}
```

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