Type "Never" cannot be expressed as JSON schema

[webmaster128]

We use

/// Never can never be instantiated and is a no-op placeholder for
/// unsupported enums, such as contracts that don't set a custom message.
#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]
pub enum Never {}

in public interfaces. However, enums with no case are not valid JSON Schema:

The enum keyword is used to restrict a value to a fixed set of values. It must be an array with at least one element, where each element is unique.

Interfaces with such a type cannot be processed to TS types and their Schema files are invalid.

[webmaster128]

Version 0.9.0 was yanked on crates.io. With this API flaw, it is of no use.