Post 4

I worked on improving existing data structures

• 1932 - Support nested tuples.
  • For example, tuple[tuple[i32, f64], i32]
• 1940 - Support optional parameters in list index method.
  • Now the method signature is list.index(x[, start[, end]]), as in CPython.

In the coming week, I will continue to add and improve other data structure methods.