Return the intersection of a circle and a line.
logical, whether to take into account
NULL if there is no intersection;
a point if the infinite line is tangent to the circle, or
strict=TRUE and the point is not on the line (segment or half-line);
a list of two points if the circle and the infinite line meet at
two points, when
strict=TRUE and the line is
a segment or a half-line, this can return
NULL or a single point.
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