Function setImplementation

setImplementation(impl: Implementation): Promise<void>
Explicitly set which implementation to use.

Use this to force a specific implementation regardless of environment. Useful for benchmarking or when you know which implementation is best for your use case.

Note: 'native' only works in Node.js.
Parameters
- impl: Implementation
  Implementation to use: 'js' or 'native'
Returns Promise<void>
Promise that resolves when the implementation is ready
Example
```
// Force JS fallback
await setImplementation('js');

// Force native (Node.js only)
await setImplementation('native');
```
- Defined in index.ts:93