class is not assignable to generic components (rfc436)

[cohlar]

With "experimentalRfc436": true enabled, vue-tsc complains when adding a class to generic components, since version 1.4.4, and still with version 1.6.0. Version 1.4.3 works fine in this regard.

Please find a link to a reproduction repo and below the exact error message:
"Argument of type '{ class: string; }' is not assignable to parameter of type '{ foo?: string | undefined; } & VNodeProps'.
Object literal may only specify known properties, and 'class' does not exist in type '{ foo?: string | undefined; } & VNodeProps'."

In the reproduction repo, please see the two errors in component TheWelcome.vue (either with vscode extension or by running yarn type-check).

[cohlar]

That was fast! ⚡