Global variable isBig used for conditional switch Endianness

[diamondo25]

I recommend setting a global variable pointing to the endianness (encoding.BigEndian, encoding.LittleEndian) over conditional switching between either variant using a global variable, to make the code simpler.

Best practice would be to not use globals at all. This helps with using golangs test framework in parallel and makes your code much cleaner. In addition to that, to figure out possible performance bottlenecks, you can use Benchmark* functions in your *_test.go files.