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2011-01-14* builtins.substring: if "start" is beyond the end of the string,Eelco Dolstra
return the empty string.
2007-01-29New primitives:Eelco Dolstra
* `sub' to subtract two numbers. * `stringLength' to get the length of a string. * `substring' to get a substring of a string. These should be enough to allow most string operations to be expressed.