assert_equal(from_json("1.234"), 1.234)
assert_equal(from_json("-1.234"), -1.234)

auto caught = false;
try {
  from_json("-1-5.3");
}
catch(e) {
  assert_equal("JSON ERROR: Number: unexpected character '-'", e.what());
  caught = true;
}
assert_equal(caught, true);

caught = false;
try {
  from_json("-15.3.2");
}
catch(e) {
  assert_equal("JSON ERROR: Number: unexpected character '.'", e.what());
  caught = true;
}
assert_equal(caught, true);