Parse fails when number literals start with zero

[Haddy1]

• What is the issue you have?
  Parsing fails for number literals beginning with "0", e.g. time stamps

Program crashes with following Error:
terminate called after throwing an instance of 'nlohmann::detail::parse_error'
what(): [json.exception.parse_error.101] parse error at line 1, column 16: syntax error while parsing object - unexpected number literal; expected '}'

• Please describe the steps to reproduce the issue. Can you provide a small but working code example?
  auto j = "{ \"time\": 080000 }"_json;

• What is the expected behavior?
  "080000" should be parsed as a numeral

• And what is the actual behavior instead?
  Program crashes with error message:
  terminate called after throwing an instance of 'nlohmann::detail::parse_error'
  what(): [json.exception.parse_error.101] parse error at line 1, column 16: syntax error while parsing object - unexpected number literal; expected '}'

• Which compiler and operating system are you using? Is it a supported compiler?
  gcc (Debian 6.3.0-18+deb9u1)

• Did you use a released version of the library or the version from the develop branch?
  Using Release 3.7.0

[nlohmann]

Numbers starting with 0 and not immediately followed by ., e, E, or whitespace are not allowed in JSON: