Avatar.Propsval check :
?size:[ `sm | `md | `lg ] Solidtype.Check.value ->
?color:color Solidtype.Check.value ->
?variant:[ `default | `soft ] Solidtype.Check.value ->
?fallback_delay:float Solidtype.Check.value ->
?class_:string Solidtype.Check.value ->
children:(_, [ `nodes ]) Solidtype.Check.children ->
?props:t Solidtype.Solid.rest ->
unit ->
unit