nbBaseSpaces top-level property Null safety

Implementation

NBSpaces nbBaseSpaces = NBSpaces(
  d0: 0,
  d1: 4,
  d2: 8,
  d3: 12,
  d4: 16,
  d5: 20,
  d6: 24,
  d7: 28,
  d8: 32,
  d9: 36,
  d10: 40,
  d12: 48,
  d16: 64,
  d20: 80,
  d24: 96,
  d32: 128,
  d40: 160,
  d48: 192,
  d56: 224,
  d64: 256,
  d72: 288,
  d80: 320,
  d96: 384,
  d05: 2,
  d15: 6,
  d25: 10,
  d35: 14,
);