Performance improvements, micro benchmarks, enhanced tests.

[jbytecode]

Dear all,

Since our package covers a good percentage of the corresponding literature, we can focus on performance improvements using micro benchmarks. We can also enlarge the test coverage for a more robust package.

Any contributions that significantly enhance the performance are welcome. Our motivation here is to have

• more faster code
• more handling edge cases
• enhanced test coverage

Any ideas can be discussed here or if needed, a new issue can be used to address the problem.

Have a nice weekend.