I'd like to request any kind of z-indexing/stacking control for 
InfoWindows.

The current behavior I've observed is that as multiple InfoWindows are 
opened at once, they are placed under previously opened InfoWindows (the 
exact opposite of what I happen to need).

A specified z-index (like markers have), an option for flipping the 
stacking order to bottom-to-top vs top-to-bottom, an option on creation or 
open to set at top, anything would work as long as it lets me exert 
control over the stacking order.

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