Feature Request: Show type signature on mouseover of lemma names in definition

[BoltonBailey]

It's very nice that when you mouse over a lemma name, a tooltip gives you the type signature. But when you mouse over the lemma name at the point of its definition, you don't get this. In fact, you might very well want to see the type signature here because looking at the definition itself isn't always sufficient - there are often section-level variable declarations in the type signature, which are sometimes very far removed from the definition, and if the user wants to see what they are, they are forced to slowly scroll up checking for them. I would like the mouseover of the lemma name at its definition to provide this information in a tooltip just as it does for mouseover of non-declarations.