Text segments in versions are transformed to lowercase

[dylan-robins]

When not using entirely numeric version numbers (such as 2.1-PRELIM-03 or 1.3-FINAL-00), the text parts are transformed to lowercase after loading using to_dict (i.e. 2.1-prelim-03 or 1.3-final-00). This means additional logic is required to process them and compare the these with what I have in the other parts of my program.

Is there a reason for this that I have missed, or shall I create a PR to (optionally?) allow users to keep the case provided in the markdown file?

[Colin-b]

I would say that this is not the expected behavior indeed. Feel free to submit a PR