Title says it all. Adding a tomlkit.items.Integer with a float will raise a NotImplementedType exception.
Here's the breaking code:
content = '[table]\nmy_int = 2048'
doc = parse(content)
doc['table']['my_int'] + 5.0
System Info
Python version: 3.8.13
Tomlkit version: 0.11.1
OS: Windows 10
Other stuff
Some quick googling looks like the same issue shows up in another project here.