Command line recall in python terminal treats strings case insensitively.

Example:
Define a 'dummy' function that takes a string as input. If you run dummy twice with the same input string, but different cases, it only saves one.
>>> dummy("This is a test") # run this
>>> dummy("THIS IS A TEST") # run again w/ different string
Now if you try cmd recall, it only recalls the first.
I believe it should recall both.
Maybe it's treating one as a duplicate - erroneously?