the following program

void main() {
  print([1, 2].take(null));
}

surprisingly prints (1, 2). i expected it to throw.
nothing about the take docs hint that it wouldn't throw nor what the behavior would be if given a null. the param isn't optional.

in fact, the take docs seem to hint that it would throw - it says that it's implemented as
TakeIterable<E>(this, count) and, poking around dart-sdk/lib/internal/iterable.dart it seems like TakeIterable's constructor is supposed to throw an ArgumentError if it's given a null.

i suspect that the docs are wrong and that Iterable#take is actually implemented as SubListIterable, which accepts a null.

but regardless of how it's implemented, it looks like a bug for Iterable#take to accept a null, especially considering that TakeIterable doesn't tolerate it.

dart --version
Dart VM version: 2.7.2 (Mon Mar 23 22:11:27 2020 +0100) on "macos_x64"