Debug function with non-string arguments

[raviqqe]

Problem

• Interactive debugging is tedious with the current implementation of a debug function.
  • Because it accepts only a string argument.
  • Although that encourages developers to write better unit tests.
• Assert functions in a standard Test package cannot print given and expected values when they are not matched.
  • e.g. Assert'Equal(x, y)

Solution

• Make a debug function's argument any type.
• Implement debug pretty printer for all types.