getFloat64 abstract method
Returns the floating point number represented by the eight bytes at
the specified byteOffset
in this object, in IEEE 754
double-precision binary floating-point format (binary64).
The byteOffset
must be non-negative, and
byteOffset + 8
must be less than or equal to the length of this object.
Implementation
double getFloat64(int byteOffset, [Endian endian = Endian.big]);