_validate_decimals

Signature

_validate_decimals(decimals: int) -> int

What problem it solves

Ensures that the precision used for labels and legends remains readable and consistent across the package plotting functions.

Input contract

• decimals must be a real integer or an np.integer.

• Booleans are explicitly rejected.

• The value must be between 0 and 20.

Where it is used

• in histogram to format ticks, the mean, and the band

• in lin_fit to format the fit legend when needed

How it fails

• ValueError if decimals is not an integer

• ValueError if decimals < 0

• ValueError if decimals > 20

Why it remains private

It is a presentation-oriented validation rule, shared internally by the plotting APIs but not intended as a standalone public utility.