I'm not sure if this is a documentation issue or an actual bug, since the code explicitly defaults to null for invalid inputs.

I'm not sure if this is a documentation issue or an actual bug, since the code explicitly defaults to null for invalid inputs.

function to_number(value) {
	return value === '' ? null : +value;
}

my understanding of the code: it should return null for empty input and NaN for invalid inputs.
the docs mention: it should return undefined for empty and invalid inputs.
the actual behaviour: returns undefined for empty inputs but null for invalid inputs.

it's so confusing :)