You can actually get a < 1.00 measurement on your hydrometer if there were many sugars to begin with and the yeasties ferment to dryness. Ethanol is less dense than water and can cause this to happen.
So, unless you know where this yeast will bottom out with this exact recipe, it isn't clear if 1.01, 1.00, or .990 will be the final stopping point. YMMV.
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