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This function converts a charstring comprising a floating-point number into a float value. The format of the number
in the charstring shall follow the rules for simple basic types and values with the following exceptions: 
- leading zeros are allowed, 
- leading "+" sign before positive values is allowed, 
- "-0.0" is allowed.
Related keyword:
| str2float(charstring value) return float | 
Example 1:
var float myf := str2float("12345.6"); // has the same value as str2float("123.456E+02")