[
  {
    "testcase": "HexStrings - Zero; odd-length",
    "value": "0x0",
    "expectedValue": "0x00"
  },
  {
    "testcase": "HexStrings - Zero; padded",
    "value": "0x00",
    "expectedValue": "0x00"
  },
  {
    "testcase": "HexStrings - Negative Zero",
    "value": "-0x00",
    "expectedValue": "0x00"
  },
  {
    "testcase": "HexStrings - One",
    "value": "0x1",
    "expectedValue": "0x01"
  },
  {
    "testcase": "HexStrings - Negative One",
    "value": "-0x1",
    "expectedValue": "-0x01"
  },
  {
    "testcase": "HexStrings - Over 32-bits",
    "value": "0xdeadbeef1",
    "expectedValue": "0x0deadbeef1"
  },
  {
    "testcase": "HexStrings - Over 32-bits (negative)",
    "value": "-0xdeadbeef1",
    "expectedValue": "-0x0deadbeef1"
  },
  {
    "testcase": "HexStrings - Over 53-bits",
    "value": "0xfffffffffffffff",
    "expectedValue": "0x0fffffffffffffff"
  },
  {
    "testcase": "HexStrings - Over 53-bits (negative)",
    "value": "-0xfffffffffffffff",
    "expectedValue": "-0x0fffffffffffffff"
  },
  {
    "testcase": "HexStrings - Over 64-bits",
    "value": "0xdeadbeefdeadbeef1",
    "expectedValue": "0x0deadbeefdeadbeef1"
  },
  {
    "testcase": "HexStrings - Over 64-bits (negative)",
    "value": "-0xdeadbeefdeadbeef1",
    "expectedValue": "-0x0deadbeefdeadbeef1"
  },
  {
    "testcase": "DecimalStrings - Zero",
    "value": "0",
    "expectedValue": "0x00"
  },
  {
    "testcase": "DecimalStrings - One",
    "value": "1",
    "expectedValue": "0x01"
  },
  {
    "testcase": "DecimalStrings - Negative One",
    "value": "-1",
    "expectedValue": "-0x01"
  },
  {
    "testcase": "DecimalStrings - Life and such",
    "value": "42",
    "expectedValue": "0x2a"
  },
  {
    "testcase": "DecimalStrings - Life and such (negative)",
    "value": "-42",
    "expectedValue": "-0x2a"
  },
  {
    "testcase": "DecimalStrings - MAX_SAFE_INTEGER",
    "value": "9007199254740991",
    "expectedValue": "0x1fffffffffffff"
  },
  {
    "testcase": "DecimalStrings - MAX_SAFE_INTEGER (negative)",
    "value": "-9007199254740991",
    "expectedValue": "-0x1fffffffffffff"
  },
  {
    "testcase": "DecimalStrings - High value not on compact boundary",
    "value": "9007199254740995",
    "expectedValue": "0x20000000000003"
  },
  {
    "testcase": "DecimalStrings - Low value not on compact boundary",
    "value": "-9007199254740995",
    "expectedValue": "-0x20000000000003"
  },
  {
    "testcase": "Numbers - Zero",
    "value": 0,
    "expectedValue": "0x00"
  },
  {
    "testcase": "Numbers - One",
    "value": 1,
    "expectedValue": "0x01"
  },
  {
    "testcase": "Numbers - Negative One",
    "value": -1,
    "expectedValue": "-0x01"
  },
  {
    "testcase": "Numbers - BigNumber Safe",
    "value": 9007199254740990,
    "expectedValue": "0x1ffffffffffffe"
  },
  {
    "testcase": "Numbers - BigNumber Safe (negative)",
    "value": -9007199254740990,
    "expectedValue": "-0x1ffffffffffffe"
  },
  {
    "testcase": "Invalid - Empty value",
    "value": "0x",
    "expectedValue": null
  },
  {
    "testcase": "Invalid - The x of 0x0",
    "value": "x",
    "expectedValue": null
  },
  {
    "testcase": "Invalid - Negative at the end",
    "value": "0123-",
    "expectedValue": null
  },
  {
    "testcase": "Invalid - Negative in middle",
    "value": "0123-456",
    "expectedValue": null
  },
  {
    "testcase": "Invalid - Double negative",
    "value": "--123",
    "expectedValue": null
  },
  {
    "testcase": "Invalid - MAX_SAFE_INTEGER",
    "value": 9007199254740991,
    "expectedValue": null
  },
  {
    "testcase": "Invalid - -MAX_SAFE_INTEGER",
    "value": -9007199254740991,
    "expectedValue": null
  },
  {
    "testcase": "Invalid - Too high; safe value",
    "value": 9007199254740996,
    "expectedValue": null
  },
  {
    "testcase": "Invalid - Too low; save value",
    "value": -9007199254740996,
    "expectedValue": null
  },
  {
    "testcase": "Invalid - Random text",
    "value": "hello world",
    "expectedValue": null
  },
  {
    "testcase": "Invalid - Bad hex character",
    "value": "0x123g",
    "expectedValue": null
  },
  {
    "testcase": "Invalid - See #935",
    "value": "0-0x1 whatever",
    "expectedValue": null
  }
]