message: Fix definition for Left() function.
  Fixes
diff: @@ -574,11 +574,14 @@ By using Chr, you can create strings containing characters which cannot be conta
  }, {
  name: 'Left',
  shortDescription: 'Returns the first n characters of s. ',
  - type: new FunctionType(new IntegerType()),
  + type: new FunctionType(new StringType()),
  file: globalFile,
  params: [{
  name: 's',
  type: new StringType()
  + }, {
  + name: 'n',
  + type: new IntegerType()
  }]
  }, {
  name: 'Len',
  