{
  "float64": -1,
  "float32": "float64",
  "float16": "float32",
  "int32": -1,
  "int16": "int32",
  "int8": "int16",
  "uint32": -1,
  "uint16": "uint32",
  "uint8": "uint16",
  "uint8c": "uint16",
  "complex32": "complex64",
  "complex64": "complex128",
  "complex128": -1,
  "generic": -1,
  "binary": -1,
  "bool": -1
}