generate the total ordinal score of a string
The idea is that given an an ASCII or lower-ordinal utf8 string,
give you a "string ordinal", a deterministic number which any set of strings
could be sorted by, without direct comparison or having access to the entire set.
The catch is that you must pre-define the max byte length of your index.
One use case could be generating ranks to use with redis sorted sets.
var score = 10;// we've created a scoring function with a max byte length of 10.console;// the result is actually an instance of justmoon/node-bignum, with a special// toString() method that zero-pads the value.// <BigNum 067097114108111115032082111100>console;// 6.709711410811112e+28
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