Describe the feature you'd like to request

• Codesandbox URL: https://codesandbox.io/s/supporting-number-type-for-next-link-ketl7u?file=/pages/index.js

I think it would be better to support the number type for next/link children.
Can I open a PR to support it if it's okay with you? :)

Describe the solution you'd like

• Draft PR URL: https://github.com/flyingSquirrel-dev/next.js/pull/1/files

// packages/next/client/link.tsx
if (legacyBehavior && (typeof children === 'string' || typeof children === 'number')) {
  children = <a>{children}</a>
}

Describe alternatives you've considered

Add a condition to check the type of children