local cases = [
  [123456, '123_456'],
  [1750000, '1_750_000'],
  [123, '1_2_3'],
  [3.141592, '3.141_592'],
  [1200.0, '1_200.0'],
  [0e101, '0e1_01'],
  [1010e3, '10_10e3'],
  [23e12, '2_3e1_2'],
  [1.12e100, '1.1_2e100'],
  [1.1e-101, '1.1e-10_1'],
  [9.10938356e-31, '9.109_383_56e-31'],
];

local sepParse(s) = std.parseJson(std.strReplace(s, '_', ''));

{
  test_results: [std.assertEqual(c[0], sepParse(c[1])) for c in cases],
}