IndexedSeqOps.head = apply(0) throws IndexOutOfBoundsException, not NoSuchElementException

[noresttherein]

Reproduction steps

Scala version: 2.13.10

Problem

Implementing IndexedSeq and not overriding head leads to an IOOBE being thrown, contrary to NSEE mentioned in the specification. This does not affect Vector, as it overrides head. The same goes for last.

[SethTisue]

@scala/collections

[OndrejSpanel]

Is it possible to fix this without breaking binary compatibility?

[som-snytt]

apply has the annotation, and this is the first time I've noticed how it is rendered:

head has only Scaladoc.