BigUint.toHexString

char [] toHexString(int  frontExtraBytes,  char  separator =  0,
             int  minPadding = 0,  char  padChar =  '0',
             LetterCase letterCase =  LetterCase.upper)

const pure nothrow @safe scope

Convert to a hex string, printing a minimum number of digits 'minPadding', allocating an additional 'frontExtraBytes' at the start of the string. Padding is done with padChar, which may be '0' or ' '. 'separator' is a digit separation character. If non-zero, it is inserted between every 8 digits. Separator characters do not contribute to the minPadding.