Numeric representation (binary & octal & grouping digits)

[tats-u]

I hope JSON5 supports these numeric representations supported by ES6 or ES2021.

• Binary: ES6
• Octal with 0o: ES6
  • Suitable for permissions
• Grouping digits: ES2021

> node
Welcome to Node.js v14.15.4.
Type ".help" for more information.
> 0o755
493
> 0b0100_0000
64
> 1_000_000
1000000

[jordanbtucker]

Thanks for the suggestion, but we've settled on keeping JSON5's features compatible with ES5, so no ES6 features will be added.

[tats-u]

keeping JSON5's features compatible with ES5

Is it intended to make JSON5 eval-able even in dying IE?
If so you might want to reconsider this specification.

FYI these do not break the backward compatibility because all of them cause syntax errors.