is there any difference between `fun <B> B?....

# announcements

[pakoito]

is there any difference between fun <B> B?.bla() = 1 and fun <B: Any?> B.bla() = 1

[nfrankel]

none i can think of
but that raises a question
why would you allow an extension function on a nullable type?
if you allow it, the developer may or may not check for nullability
and in the latter case, raise a NPE
if you add the extension function on a non-nullable type
you force him to handle it anyway

[razvandragut]

there might be some difference related to * type projections and Nothing ... but I'm not sure

[pakoito]

@nfrankel it’s precisely to deal with nullability: https://github.com/arrow-kt/arrow/pull/974/files#diff-abc40fa67f0859e5adf63f2bf6e9b090R339

[nfrankel]

got it 🙂