TYP: More precise NaT stubs

[randolf-scholz]

Feature Type

• Adding new functionality to pandas

• Changing existing functionality in pandas

• Removing existing functionality in pandas

Problem Description

Amendment to #59996. The current stub has some imprecise typing.

Feature Description

• inequalities do not cover comparisons of NaTType with itself.
• addition/subtraction does not cover pd.Period and numpy types.
• dunder methods should be marked with positional-only parameters, even if the class supports keyword usage.

Alternative Solutions

N/A

Additional Context

No response