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When modifying or extending public interfaces, ensure changes maintain backward compatibility and follow proper versioning practices. Key guidelines:

1. Make interface additions optional: ```typescript // Instead of interface HttpServer { newMethod(): void; }

// Do this interface HttpServer { newMethod?(): void; }

2. Use union types for extending existing types:
```typescript
// Instead of
type Version = string;

// Do this
type Version = string | (string & {}) | ((version: string) => boolean);

1. When adding new functionality that could break existing implementations:
   • Create a new interface/type that extends the base
   • Add configuration options to enable new features
   • Wait for major version releases for breaking changes
2. Document version support clearly: ```typescript @Controller({version: ‘2.x’}) class MyController { @Version(‘>=2.5.1’) @Get(‘:id’) newMethod() {}

@Version(‘<2.5.0’) @Get(‘:id’) legacyMethod() {} } ```

These practices ensure API consumers can upgrade safely and maintain compatibility with their existing implementations.