Constant non_std::dependencies::strs_tools::string::number::protected::format::LEADING_DIGIT_SEPARATOR

pub const LEADING_DIGIT_SEPARATOR: u128 = INTEGER_LEADING_DIGIT_SEPARATOR | FRACTION_LEADING_DIGIT_SEPARATOR |
    EXPONENT_LEADING_DIGIT_SEPARATOR; // 240_518_168_576u128

A digit separator is allowed before any digits.