Constant lexical_util::format::RUBY_OCTAL_LITERAL

pub const RUBY_OCTAL_LITERAL: u128 = NumberFormatBuilder::new()
    .digit_separator(num::NonZeroU8::new(b'_'))
    .mantissa_radix(8)
    .required_digits(true)
    .no_special(true)
    .internal_digit_separator(true)
    .build(); // 162_259_276_830_965_804_078_610_482_463_759u128

Number format for a Ruby literal floating-point number.