Type Alias CollideXZ

Clamps one frame's intended horizontal move to wherever collision actually allows - the hook mwg/3d's own grid collision (resolveCapsuleAgainstGrid) plugs into. blocked, when the resolver reports it (resolveCapsuleAgainstGrid always does), tells update directly whether the move was cut short, rather than update re-deriving the same fact by comparing the resolved position against the intended one through separate floating-point arithmetic - two numbers that are conceptually equal are not guaranteed bit-identical.