DynFixed objects support the manipulation of IDL fixed values.
Because IDL does not have a generic type that can represent fixed types with arbitrary
number of digits and arbitrary scale, the operations use the IDL string type.
Sets the value of the DynFixed.
The val string must contain a fixed string constant in the same format as used for IDL fixed-point literals.
However, the trailing d or D is optional. The return value is true if val can be represented as the DynFixed
without loss of precision. If val has more fractional digits than can be represented in the DynFixed,
fractional digits are truncated and the return value is false.
TypeMismatch - If val does not contain a valid fixed-point literal or contains extraneous
characters other than leading or trailing white space
InvalidValue - If val contains a value whose scale exceeds that of the DynFixed
or is not initialized