Constant lexical_util::format::C18_HEX_LITERAL

pub const C18_HEX_LITERAL: u128 = NumberFormatBuilder::new()
    .case_sensitive_special(true)
    .required_exponent_notation(true)
    .mantissa_radix(16)
    .exponent_base(num::NonZeroU8::new(2))
    .exponent_radix(num::NonZeroU8::new(10))
    .build(); // 13_302_989_070_119_886_811_021_914_751_482_480_652u128

Number format for a C++98 literal hexadecimal floating-point number.