Validate and normalise the add_other argument

Python's default for add_other is "prompt", which calls input(). In non-interactive sessions, Python's input() raises EOFError, which the Python code catches and treats as "no". The R default matches Python's default ("prompt"). This helper validates the user's input.

Usage

.validate_add_other(add_other)

Arguments

add_other

FALSE, TRUE, or "prompt".

Value

The validated value (unchanged if already valid).