Question: why won't implicitplot use the range I ask for?

Example:

implicitplot(x^2 + y^2 = 1, x=-2..2,y=-2..2)

This command produces a plot with the range x = -1..1, y = -1..1 instead of what I specified.

 

I don't remember this being a problem on the older editions of Maple. 

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