Datasheet here

    http://ww1.microchip.com/downloads/en/DeviceDoc/30009996g.pdf

DS is unsurprisingly silent on this.
(p359 on)

I'd EXPECT it to be within half a whisper of Vdd, but ... .

Adding a large value pullup would (may) assist if highness matters.
You knew that.

                  Russell

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