AttributeError with `timeinterval.githubformat()` and input `2025-02-10..2025-02-28`

[amotl]

Problem

  File "/Users/amo/dev/tech-writing/sources/rapporto/.venv/lib/python3.12/site-packages/aika/model.py", line 37, in githubformat
    buffer = f"{self.start.strftime(github_datetime_format)}"
                ^^^^^^^^^^^^^^^^^^^
AttributeError: 'str' object has no attribute 'strftime'

Reason

This shortcut uses cast to trick the type checker, but does the wrong thing.

aika/aika/core.py

Lines 139 to 140 in a15202e

	if ".." in when:
	return t.cast(trange, when.split(".."))