DegenerateDipoleException

The collapse of a would-be Dipole into a single flat point — no dipole exists to build.

Thrown by the Dipole constructor when the whole g-part (gx, gy, gz) rounds to zero at the SCALE quantum: the remaining blade lies in the e41/e42/e43 span and is the flat point point, not a dipole. An all-zero input carries the zero flat point.