A cone a millionth of a radian wide has bins so thin that walls beside it
are tens of millions of bins away, and at 1e-300 radians past any integer:
the chain walk looped over every one and bin lookups overflowed. Clamp the
indices while they are doubles, as the native query does, and send NaN
(bins with no width at all) to the first.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>