Tests if the given point lies in or on the envelope.
@param x the x-coordinate of the point which this Envelope isbeing checked for containing
@param y the y-coordinate of the point which this Envelope isbeing checked for containing
@return true if (x, y) lies in the interior oron the boundary of this Envelope.
Indicates whether this gridsubset coverage contains the given tile
@param index the tile index to check for coverage inclusion
@return {@code true} if {@code index} is inside this grid subset's coverage, {@code false} otherwise
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