Stateless components

[aalin]

Components that don't implement any callbacks don't have to be instantiated.

I think there is a type called LambdaComponent that we just need to check for somewhere in lib/mayu/vdom/vtree.rb or maybe we could do it in vnode.rb

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Could maybe also not instantiate descriptors for text elements and comments...
Or maybe implement lighter descriptors for them since they don't have props, keys nor children...

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It would be good to do #56 first