(BigDecimal)
           /      \
    (BigInteger)   \
       /   \        \
<~ ULong   Long ~> Double ..
..   |    /   |   /   |  \..
  \  |   /    |  /    |
    UInt     Int    Float
..   |    /   |   /      \..
  \  |   /    |  /
   UShort   Short
     |    /   |
     |   /    |
   UByte     Byte
       \     /
       \    /
      Nothing