Function numeric_out_sci 

pub fn numeric_out_sci(v: &Numeric, scale: i32) -> String

numeric_out_sci: the value as a significand with scale digits after the point, e, a sign and at least two digits of the exponent, as to_char with EEEE writes it. The exponent is the power of ten of the first digit. The significand is the value divided by that power and rounded half away from zero, so it can be 10.0 after the rounding, as in get_str_from_var_sci.