@extra-string/hex-digits.min (npm): The string '0123456789abcdefABCDEF'.
Keywords: extra|string|hex|digits|HEX_DIGITS|at|compare-function|hex-digits|infix|is-infix|is-prefix|is-suffix|left|letters|lowercase|map-function|prefix|replace-function|right|size|suffix|test-function